ORYKTOLOGIKA NEA-NEWS ON MINERALS (January-February 2015 issue)

-NEWS ON MINERALS - 1 - Vol 30 - 175 - 2015

NEWS ON MINERALS

Vol. 30 , No 175 , January-February 2015 30 , 175 , 2015

15€ - Price of each issue 15 €

- HELLAS - PIRAEUS ISSN 1011-5870


, – Botryoidal aragonite,Lavrion ,Greece

(10 X 7 X 4 cms- .)

Alexandra G. Minatidou

–NEWS ON MINERALS GeMin .

The Inspirer and the Soul of ORYKTOLOGIKA NEA -NEWS ON MINERALS and GeMin Expo in GREECE Die Instigator und die Seele der ORYKTOLOGIKA NEA-NEWS ON MINERALS und GeMin Expo in GRIECHENLAND


ORYKTOLOGIKA NEA NEWS ON MINERALS

ISSN 1011-5870 1986

Established in January 1986)

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- NEWS ON MINERALS

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ORYKTOLOGIKA NEA -NEWS ON MINERALS

– Photo in cover

Chrysoprase from Ethiopia

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Hello! With great pleasure we announce that with January-February 2015 issue we enter in the 30th year of circulation of ORYKTOLOGIKA NEA -NEWS ON MINERALS. Thirty years of searching, adventure, suspense, expectations, happiness, satisfaction ie a mixture of exciting emotions , which gives us the strength to continue. We thank God for giving us the opportunity to reach here, our Parents , but we also thank once again all the Friends Collectors , Partners , Subscribers and Mineralogical magazines around the world who supported the entire effort, cooperated with us to show more on the most exciting Hobby in the world : Collection and study of Minerals and Fossils. The name of GeMin Exhibition is for many years directly related to ORYKTOLOGIKA NEA -NEWS ON MINERALS and we will be happy to give great pleasure for many years to collectors in Greece and abroad.

The Historical Team Of ORYKTOLOGIKA NEA-NEWS ON MINERALS

Evanghelia G. Minatidou

Petros E. Solomonidis Dimitris G. Minatidis


Seminars on Mineralogy by ORYKTOLOGIKA NEA-NEWS ON MINERALS


Seminars on Mineralogy by ORYKTOLOGIKA NEA – NEWS ON MINERALS–Some highlights -NEWS ON MINERALS –

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. Interested people with various educational and professional background attend the Seminars on

Mineralogy in a room full of Minerals and Fossils , i.e. in their Natural Environment !


Participants in these Seminars on Mineralogy have the chance to see IN LIVE actual specimens exhibiting various properties as described in Mineralogy text books.

-NEWS ON MINERALS - 7 - Vol 30 - 175 - 2015 Mammoth Teeth, Mammal Fossil ,from Ice Age , Russia and Fossil fishes from Brazil !

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For availability and more information / : . 6974634649

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The photograph clearly shows from the teeth that the animal was vegetarian. ( 22 X 12 X 8 cms – . , – weight 1732 grams- )


Do the teeth just below belong to a mastodon ?

Very well preserved fossil teeths showing vegetarian animal.

(8,5 X 4,5-3,5 X (5-6 ) . – cms – Weight – 308 – grams

Huge fossil t th of mammoth , a vegetarian animal . , .

(29 20,5 8 . – cms / weight- : 6,5 – kilos )


Teeth are an easy way to determine whether a fossil is a mammoth or a mastodon. Just above is

a mammoth tooth. Notice the flat surface with ridges for grinding vegetation.

Fossil fishes from Brazil

The Brazilian state of Ceará is known for its fossil fish exports. Especially the State of Ceará is known for its fish fossils in nodule shape. A nodule is a calcareous deposit in an ovoid shape formed around a dead animal, which makes that it is preserved in excellent condition. The well preserved fish are from the lower Cretaceous period (Aptian and Albian), and are about 80 milion years old. The best known fish from this location is the Vinctifer comptonii, an Aspidorhynch species. These fish are found in so called fish-breads. Concretions ,as said above, with the fossil fish inside.

Is the above fossil fish Rhinobatos beurleni ?

Size of calcareous septarium nodule 30 X9,5 X 6,5 cms- . /Size of fossil fish 26 X 5 X 2 cms- ./Weight : 2686 grams


This looks like Tharrias araripes.

Upper half : 29 X 11,5 X 4,5 cms /Fish size : 27,5 X 4,5 X 4,5 cms / Weight – : 2105 - Grams Lower half : 29,5 X 11 X 3 cms / Fish size : 24 X 4,5 X 3 cms / Weight- : 1824 – grams

Outside view of fossiliferous calcareous nodule enclosing fish fossils.


-GEOMARKET- -GEOMARKET- - MINERAL SPECIMENS

- Superb azurite and malachite specimens from Lavrion , Hellas in sizes from T/N to Museum Specimens in prices from 15 Euro upwards. Nature has created some of the best azurite and malachite specimens on Earth in the classic European locality , Lavrion in Hellas. - Slag specimens , Lavrion , Hellas. Slag specimens 3000-5000 years old with vugs filled with minerals in small perfect crystals. 15 EURO each. Minimum 10 slags. * Also nice mineral specimens from Lavrion for collectors from 15 € (T/N size) each ( baryte, fluorite , smithsonite , malachite. dog-teeth ankerite and other species). * Double terminated black tourmaline and dravite crystals from 5 € each. ** Please add for postage and handling , depending on the weight of the specimens and the way of shipment (Air or Surface Mail) . --- European Union ( ) Residents add 23 % V.A.T. on total cost.

( ) -MINERAL POSTCARDS (LAMINATED) set of 12 color high quality mineral postcards depicting the following mineral specimens from various localities

around the world : 1. Sapphire 2. Ruby 3. Emerald (Facetted) 4 . Pyromorphite 5. Pyrrhotite on Calcite 6. Rhodochrosite + aegirine + genthelvite 7. Cubanite xls 8. Pyrite crystals 9. Quartz , variety , amethyst- sceptre habit 10. Serandite 11. Diopside on grossular 12. Amethyst 13. Gypse Price 40 EURO Air Mail post paid.

CD-ROMs on Earth Science- CD-ROMs * The Theory of Plate Tectonics 75 € * Illustrated Dictionary of Earth Sciences 50 € * The Wonders of Rocks and Minerals 75 € * The study of minerals 90 € * Plate Tectonics and how the Earth works 75 € * Life in Amber 85 € * The Photo-Atlas of minerals 95 € * Hands-On Mineral Identification 40 € (European Union Residents add 23 % V.A.T.) GEMSTONES AND MINERALS -

(T/N size) (miniature size) , . -Ask to see the collections of minerals for Systematic Mineralogy in which every specimen either in T/N size or in miniature size is in plastic box labeled with name of mineral and its origin. -For fine mineral specimens visit http://www.gemin.eu –

http://www.gemin.eu - SHOWS – –SHOWS –

2015

Exploring the wonder of the Earth's mineral treasures through collecting, preparing and sharing of mineral specimens , gemstones and Fossils.

USA – Tucson ,AZ : Jan. 31 through Feb. 15, 2015 . Info : Jessica Stephens , Director of Public Relations Tel. 800-638-8350 ext. 143 , [email protected]

USA Indianapolis , Indiana : 20-22 February 2015: GeoFest . Info : [email protected] Italy – Bologna : 6-8 March 2015 . Info : http://www.bolognamineralshow.com/ USA –Newark , California : 6-8 March 2015 . Info : [email protected] USA – Abilene ,Texas : 11-12 April 2015 .Info : [email protected] France – Alsace : 25th June 2015 - 28th June 2015 , Sainte Marie-aux-Mines Mineral show 2015 . Info : Mairie

114 rue de Lattre de Tassigny , Marque Mineral et Gem LOW68160 Sainte-Marie-aux-Mines , France Phone: + 33 3 89 73 53 52 , Fax: + 33 3 89 58 48 57 , [email protected]

Germany – Munich , 30 Oct- 1 Nov. 2015 . The Munich Show - Mineralientage München-World of Minerals, Gems, Jewellery and Fossils . Info : [email protected]

Greece - Athens : 29th GeMin 2015 , 4-5-6 December 2015 . Information : GeMin, c/o ORYKTOLOGIKA NEA - NEWS ON MINERALS ,Gr. Lambraki 70 , Piraeus, EL-18532, Hellas. Tel+30-213-025-8688 , FAX:+30-210-4132-570 , e-mail : [email protected] , http://www.gemin.eu .Tel+30-213-025-8688 , FAX:+30-210-4132-570 .

Germany-Munich:30th October 2015 -1st November 2015 . Info : +49 (0) 89-613 47 11 ,[email protected] Germany – Hamburg : 4 Dec-6 Dec. Further information: http://www.mineralien-hamburg.de

– Condolence - Kondolenz 6 2015 , , , ,

. " ". "The old Rockhounds never die , they just slowly petrify".

. - On 6th February 2015 , the World of Mineral Collectors not only in Greece , but all over the world, became poorer: Our beloved Anastassios-Sotirios Vafidis began his journey to the endless infinity. He will be missed by all of us. But remember : "The old Rockhounds never die , they just slowly petrify" – «Die alte Rockhounds sterben nie, sie nur langsam versteinern»


2015

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International Geological Photography Contest 2015

ORYKTOLOGIKA NEA-NEWS ON MINERALS invite all readers and collectors to get during their vacations a geological , mineralogical photograph , print it in A4 size photographic paper with description of depicted object , name and full contact information of photographer and send it to ORYKTOLOGIKA NEA-NEWS ON MINERALS with the indication “Geological photography Contest” until 5 November 2015 . All submitted photographs will be on display during the 29th GeMin 2015 to be held in Athens , Greece on 4-5-6 December 2015. Visitors will vote for the best photographs and the first 3 winners will win Minerals or Gemstones or Fossils. Best of luck to all of you ! The contest is heavily relied on mineral specimens , crystals , fossils but Geowonders are also sought most for. May be submitted up to 3 photos per contestant ORYKTOLOGIKA NEA-NEWS ON MINERALS , [ For the Photography Contest 2015 ] , Leof. Gr. Lambraki 70 , (Formerly Queen Sofia Avenue), Piraeus , EL-18532 , Greece. Peculiar Quartz crystal from Brazil –

(8 X 1,5 X 1,7 cms- .)

. – From the collection of K. Gigakis)


Gemstones from Ethiopia

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Various types of Ethiopian Chrysoprase are seen above.

– Acknowledgement- Danksagung All specimens in this article are courtesy of Mr. Zelalem Getnet , [email protected] , whom we thank for his

cooperation . . Zelalem Getnet .

ETHIOPIA GEMSTONES occur into two main rock assemblages: (1) the Precambrian and (2) Phanerozoic rock types. Precambrian rocks of the country hosted few gem minerals such as, ruby, sapphire, garnet, beryl (aquamarine, emerald), Tourmaline, of sub economic deposit type and many semi precious gemstones. These are well documented in western, southern and eastern Ethiopia closely related to pegmatic-granite rocks and associated metavolcano-sedimentry rocks. From all areas, the Moyle-Aroro-Yavello belt in Oromia National Regional State are known to be sub economical and currently mined by many Artisanal miners and cooperatives. This belt is showing different precious minerals including Beryl chrysoberyl, aquamarine, garnet, corundum (ruby, sapphire), and quartz, and many others, similar to the deposit of Kenya. This belt has also various gemstones, including the Peridot/ olivine (in Mega area), fluorite, Amazonite, probably, increase the economical significant of gemstone of southern Ethiopia, but it requires detailed work to verify those. Other areas also have different quality gems associated with Precambrian rocks of Ethiopia, such as northern, eastern and western Ethiopia but little is known so far on their type, mode of occurrence, quality of gems.


– Amazonite specimens from Ethiopia

Map of Ethiopia

(Courtesy : Google Earth)


Location map of gemstone occurrence in Ethiopia

(From – : Opportunities for Gem resource development in Ethiopia ,Geological Survey of Ethiopia ,

Addis Ababa , Ethiopia , 2009.

The Phanerozoic related gemstones documented in different parts of the Ethiopian closely associated with sedimentary, volcanic shield and rift related rocks. Huge and numerous type of opal, agate, petrified wood, amber, chalcedony, Amethyst, obsidian, citrine, fluorite, jasper, and many others. The distribution of those gemstone erratic but it show huge nature associated with different gemstones types. The few gemstone like jasper, quartz and agate, chalcedony gem types are located in the thick Mesozoic-Cenozoic sedimentary (Abay, Mekele and Ogaden sedimentary basin) and many others such Peridot/ olivine, opal, jasper, quartz and many others in the volcanic terrain in the central (Ethiopia high land and rift zone) areas. Out of those, gemstone areas, the Mega-Yavello belts in Oromia and Mezezo-Wollo-Gonder in Amhara Regional State are currently mined/under licence by local people, cooperatives and private companies. GEMSTONE BELTS OF ETHIOPIA Gemstones of the country can be grouped into two main belts: (1) the southern and Central north Ethiopia main belts (2) and western and Eastern Ethiopia minor belts. The southern and Central Ethiopia main belts--which are further classified into (1)Moyle-Mega-Yavello/MMY/ gemstone belts and II) Mozozo-Wollo-Gonder gemstone belts. MMY Gemstone belt is underlying by high grade gneissic rocks and unique pyroclastic and dunite assemblage covering wide area extending from Ethio-Kenya boarder to the Arasi-Bale highlands. This belt shows variable gemstone varieties from Beryl, corundum, garnet and quartz groups to tourmaline, fluorite, with minor opal and quartz family gemstones. Besides, it has unique Olivine and peridot/olivine show close relationship accessories minerals of garnet, ilmenite, pyroxenes and carbonatitic bodies associated with basaltic-tracahyte-basalatic with inclusions of peridotite and dunite, having an alkaline affinity. Others , such as Amazonite and different gemstones are believed to exist in different parts of the belts, Mozozo-Wollo-Gonder gemstone belts/MWG belts/ and occur in central north Ethiopia covering parts of the rift margin extending from North Showa the Debere Berhan to north Wollo and parts of Gonder, within the Amahara National Regional State. The belts have huge gemstone varieties from opal-amber to agate, petrified wood and others semiprecious gemstones, with minor variation in type and nature.


1 2

3

4 5

6 7 8 1. Citrine – , 2 -8 Green Tourmaline – , 3-7 Peridot (Gem Olivine) –

) , 4-5 - Almandine garnet , 6 – Rhodolite garnet

-NEWS ON MINERALS - 17 - Vol 30 - 175 - 2015 Unique Opal-amber gemstone variety (with highly prized iridescence play of colour or the fire opal type), is found at Mezezo in Amhara Regional State (Debre Berhan-Mehal Meda) within the Menz & Gishe, Tegulet and Bulga zones, within the locality of Yita, Kosta Amaba, Gift, Bahir, Gift Gaymeda, Lay Beret, Wenze Midire, Gorat and Wedera Kables/ Wereda. Similar but most precious, black and colored opal with play of color is found in WagenTana, Tasih Moucha, Geshin Mariam (South Wollo and Faeta (south Gonder) in many others and Afar areas (not mapped). Most Opal bearing belts are related to in welded lapilla rhyolite-ignimbrite rocks and tuff rocks. OTHER GEMSTONE SHOWING AREAS Few areas, in Tigray, Southern Nation Nationality People (SNNP) and, eastern Oromia, also show some opal, Jasper, Chalcedony, agate, amber, quartz, near the contact of the volcanic and Mesozoic sediments in Hierna area and in the Abay canyon. Similar gem varieties of Chalcedony, Amethyst, Agate, petrified Wood, documented and associated volcanic rocks in Tigary (Adwa and Axum), northern Showa and Wollol (Mehale Meda Ankober, Sela Dinga , Jehur, Debre libanose Yita Mechael), Kutaber. Occurrences of precious opal are reported in Gonder (Nefase Moucha?), Warder, Ogaden, and Dire Dawa. TYPE AND CHARACTERISTICS’ OF ETHIOPIA’S GEMSTONES The gemstones of the country classify into 9 main group; starting from most precious and dominant sequence of : Opal , Corundum , Beryl , Garnet , Peridot , Quartz species and Tourmaline, Amber and others; (a)Petrified wood, ( (b) Obsidian, (c)Feldspar, (d) Apatite, (e)Fluorite, (f) Kyanite, (g) Zircon and (h) Topaz , Phenakite, Scapolite, Sphene, , lolite of less precious gemstones types. Addressing the characteristic, type, mode of occurrence, geological setting, nature of gemstone deposit of the country will improve both the understanding and increase the awareness of the resource usage and promote growth of mineral subsector of the country. Bibliography : Opportunities for Gem resource development in Ethiopia ,Geological Survey of Ethiopia , Addis Ababa , Ethiopia , 2009.


LEARN ON THE MINERAL WEALTH OF THE COUNTRIES VIA MINERAL POSTAGE STAMPS

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, . The best gift for the students and the newcomer in the collection of mineral, gemstone and fossil postage stamps .

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-Another way to attract the interest of junior and senior Mineral,Gem and Fossil Collectors is the collection of postage stamps depicting Minerals, Gems and Fossils

** Mineral Wealth of Hellas , Mint Set , 7 stamps (1980) 10 EURO ppd

** First Day Cover (F D C) 12 EURO ppd.

** Maximum Cards on the same topic 75 EURO ppd (Total number of sets in circulation 500-Limited offer).

20

GeMinCOMMEMORATIVE COVER ON THE 20 YEARS JUBILEE OF GeMin EXHIBITION

- -NEWS ON MINERALS

20 GeMin. -NEWS ON MINERALS . 5€.- On the occasion of 20 years of GeMin

Exhibition in Athens , Hellas , ORYKTOLOGIKA NEA-NEWS ON MINERALS have released a Geophilotelic Document cancelled at the National Philotelic Museum. The commemorative cover will be available by this publication until end of stock. Price 5 €.

ORYKTOLOGIKA NEA-NEWS ON MINERALS :

Your best source on Geophilotelism in Hellas-

-NEWS ON MINERALS - 20 - Vol 30 - 175 - 2015 YOUR MINERAL ,GEMSTONE ,JEWELLERY AND FOSSIL SOURCE DOWNTOWN PIRAEUS , GREECE

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In our shop “ -Design” , downtown Piraeus , you will find a selection of fine mineral specimens from various parts of the

World ,fossils as well as top gemstones and hand-made sterling silver 925 gemstone jewellery. When in Piraeus , Greece , come and visit us.

“ -Design” ,

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_________________________________________________________________________________________________________ Visit our new Mineral shop downtown Piraeus –

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We continue the tradition : “Quality is more important than quantity” ! Visit our new shop downtown

Piraeus and choose Natural Genuine Earth Treasures from around the World ! – See more in next pages

- Design» along with ORYKTOLOGIKA NEA-NEWS ON MINERALS shop


Possibly your best JEWELLERY connection with India


Keep in touch with one of the best magazines in Gem and Jewellery Industry

Bleiben Sie in Kontakt mit einem der besten Zeitschriften in Edelstein und Schmuckindustrie


FROM THE GALLERY OF ORYKTOLOGIKA NEA-NEWS ON MINERALS

- Minerals of the World (ISBN 0-444-42135-1)

- 200 , , . 80 130 . . :

85 € , . - A laminated wall chart 80 X 130 cms with photographs of 200 minerals and plentity of data on crystal systems and other mineralogical information. A top educational product for every school , Mineralogical Laboratory , and professionals . Price : 85 EURO including packing , lamination and shipping.

– THE HELLENIC FLAG

– A REAL JEWEL -NEWS ON MINERALS:

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MINERALS - 2009 , Badakshan ,

( ) : 213 -025-8688 , 6979771898 , FAX : 210- 4132- 570 , [email protected] on-line - Buy on-line : http://www.gemin.eu/el/gallery38.htm

The wonders of Rocks and

Minerals

- CD-ROMs

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ON MINERALS. 1. The Wonders of Rocks and Minerals 2. The Study of Minerals -Two of the best CD-ROMs on Mineralogy are available by ORYKTOLOGIKA NEA-NEWS ON MINERALS . These wonderful and very informative CDs are available at 165 EURO + 10 EURO shipping and handling Write now to : ORYKTOLOGIKA NEA-NEWS ON MINERALS , FAX : +30-210-4132-570 , [email protected], [email protected]

The Study of Minerals


Rauris ,

Adularia crystals , Rauris , Austria (8 X 8,5 X 3,5 cms – .)

– Mining Lamps for Collectors

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- Collect a piece of History. Add in your Mineral and Gemstone Collection a perfect copy of a mining lamp which used to be (and is) the “right hand” of miners , that is , of all those people who work down under the Earth in adits and mining galleries to mine and bring in the surface the raw metalliferous and industrial minerals , so necessary to make our life more comfortable


''Black Opal'' from Lebak Banten, Indonesia Lebak Banten .

By Reval Raafinsky , [email protected]

Kalimaya Black Opal is a mineral that is classified as a precious stone with popular name “Opal”. Kalimaya is came

from a place name, namely “Maja”, which is located in the Maja area, Lebak regency, Banten province, Indonesia. The

name it’s self, Opal is comes from the latin word '' Opalus '' and '' upala '' which means precious stones and from the Greek

word ''Opallios '' which means “change color”. According to the scientific terms , Opal is a mixture of silica and water

with SiO2.H2O formula. Black Opal is a type of stone from Indonesia, which is also commonly called '' Kalimaya black

opal '', And one of superior stone products in Indonesia.

Sought after by worldwide gemstone collectors, the color and beauty of the Indonesian typical pride stone, it is also

the main attraction for gemstone lovers, or collectors throughout many countries. Even the '' Black Opal '' is included in 10

of the most expensive and rare type of rock in the world.

''Black opal '' is the rarest type of Opal stone, it is also the most beautiful type of Opal and known as “The Queen of

Gemstones” ( The Queen of Gemstones ). Therefore, Black Opal is the type of most Opals in demand.

It has a different character than many other gemstones. Lebak Black Opal Kalimaya have more vivid colors, besides

that, the texture of Lebak Kalimaya jewel is look more rugged.

Therefore, the market price of Kalimaya Black Opal is quite expensive and hunted by numerous domestic collectors and

collectors from many other countries.

The nature of the original Kalimaya Black Opal stone:There are important things that need our attention to try to see the

distinctive characteristics of Kalimaya '' black opal ''. With a quick way so that we can distinguish the original (genuine)

rock and artificial (faked) rocks (false):

1. Combustion, Kalimaya Black Opal stone is resistant to heat and cool rapidly. It can be proved by using matchsticks.

2. Waste, the nature of precious rock is resistant to chemicals such as paints or oil. For verification we can use a paint

that was affixed in the Kalimaya stone then if swabbed will not cause scars.


3. Stone fiber, artificial stone made of fake synthetic material has no fiber, so we can see the glossy stone surface very

clear.

4. Heavy or weight, characteristics of weights of the original Black Opal is heavier than the fake one.

Geological Conditions

This Black Opal Stone is from Banten Province, Indonesia. This Province has a landscape consisting of plains region as

lying between Tangerang and Serang. Undulating hills (between Serang - Pandeglang - Cibaliung) and the mountains that

scattered in the South part with Sanggabuana mountain (1919 m. alt.), Halimun Mountain (1929 m. alt.), Endut Mountain

(1297 m. alt.) and Nyungcung mountain as the peaks.

The state form of the landscape is very closely linked to the regional geological conditions Banten that is part of the

path/Tertiary magmatic arc-Quaternary which stretches from the northern tip Sumatera Island to Nusa Tenggara, known

as the Sunda-Banda Magmatic Arc. In Banten, this arc formed as a domes, dikes and active volcanic cones.

Geological conditions above yield potential mineral resources and attract quite abundant Geotourism.

Old volcano rocky area that was intruded by younger intrusive rocks, is the seat of precious metal mineralization and base

metals gold and lead. While the younger region of volcanic rocks area is a prospects for industrial minerals such as quartz

sandstone, basalt, bentonite , zeolite , clay, toseki and tras, also the other minerals that are very prospect as Sempur

stone (fossil wood) and gemstone like Opal (Kalimaya).

Here is a Lebak Banten area and also a map of Indonesia :

Specification:

Name : Kalimaya Black Opal / Dimension : 21 cm x 13 cm x 10 cm / Weight : 5 kg / World Market Price : US $ 2500 / ct Our Price: US $ 150/gr , US $ 150.000/kg , Total: US $ 750.000 (Attention please : Prices are in Decimal system)

sample finished process


Note by the Editor : For additional reading on Geology of Indonesia

Opal is a beautiful precious gemstone that is equal or more valuable than diamond. In Indonesia, precious opal is

found at the Lebak Regency, Province of Banten. Banten’s opal widely has been recognized due to its beautiful

opalescence.

Mineralization model is divided into three periods; at Early Pliocene volcanic clastic sediments rich in volcanic glass

occured as fluvial sediments. Afterwards, at Late Pliocene - Pleistocene folding, weathering and leaching of silica

took place. Intensive jointing, faulting, and folding quickened weathering and leaching processes to formed opal at

limb of anticline through Holocene. The prospecting area of Banten’s opal is in tuff unit with intercalation of

conglomerate or pumiceous breccia, at limb of anticline. The host rock of opal is dark grey claystone which

underlies polimict conglomerate/pebbly sandstone sequence with cross stratification, imbricated, and erossional

stucture; more than 8 m deep.

- Bibliography

Ansori, C., Siregar, S., dan Sumantri, T.A.F., 2003. Preliminary Study of Opal Genesis at Lebak Regency, Banten.

Proceedings Internasional Conference On Mineral and Energy Resources Management UPN ‘Veteran’, Yogyakarta.

Ansori, C., Harijoko, A., dan Warmada, I. W., 2006. Characteristics and Genesis of Precious Opal-CT from Banten,

Java, Indonesia. Proceedings The 8 th Field Wise Seminar and 3nd Internasional Symposium on Geological

Engineering Education; Department of Geological Engineering Faculty of Engineering, Gadjahmada University.

Yogyakarta, h. 294-304, GLB: 04788.

Ansori, C., 2008. Penentuan Tipe Opal Banten Berdasarkan Analisis Geokimia. Jurnal Bahan Galian Industri,

Puslitbang Teknologi Mineral dan Batubara (TEKMIRA) - ESDM, Bandung, 12 (34), h. 20-31.

If you want to know more on Geology of Indonesia you can buy the publication below :

[Courtesy : Indonesian Journal of Geoscience]

-NEWS ON MINERALS - 29 - Vol 30 - 175 - 2015 Sphene crystals with quartz on rock matrix from Tormiq Valley, Haramosh Mountains, Skardu District,

Baltistan, Pakistan

Sphene crystals with quartz on rock matrix from Tormiq Valley, Haramosh Mountains, Skardu District,

Baltistan, Pakistan , (12 X 7,5 X 6,5 cms- .)


Sphene crystals with quartz on rock matrix from Tormiq Valley, Haramosh Mountains, Skardu District, Baltistan, Pakistan , (12 X 7,5 X 6,5 cms- .)

Sphene crystals on rock matrix from Tormiq Valley, Skardu District, Pakistan(12,5 X 9 X 6 cms- .)


– From Europe STA NERALOG CA TAL

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nnual Fees : 35 EURO , Overseas: US $ 45- U.K. JOURNAL OF MINES AND MINERALS

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Jewellery & Luxury , Possibly your best JEWELLERY connection with India . Mr. Raj Salian ( editor & publisher ) , www.jewelleryandluxury.com . e-mail : [email protected]


, – Kyanite crystals in milky quartz , India

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ORYKTOLOGIKA NEA-NEWS ON MINERALS (January-February 2015 issue)

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