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$21.00
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28/07/2018 05:11 pm
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69.95 CTS RARE EMERALD GREEN DIOPTASE FROM KAZAKHSTAN MGW119

SKU
Dimensions (mm)
x x mm
Weight (cts)
Shape
Emerald
Colours

MINERAL GEM WORLD

RARE DIOPTASE

This is a natural untreated specimen on its natural matrix from Kazakhstan

Great specimen.

Weight 69.95 cts app

Size 26 x 23 x 22 mm app

Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral. It is transparent to translucent. Its luster is vitreous to sub-adamantine.

Late in the 18th century, copper miners at the Altyn-Tyube (Altyn-Tube) mine, Karagandy Province,Kazakhstan thought they found an emerald deposit of their dreams. They found fantastic cavities in quartz veins in a limestone, filled with thousands of lustrous emerald-green transparent crystals. The crystals were dispatched to Moscow, Russia for analysis as they thought they were Emeralds.

Dioptase is a very rare mineral found mostly in desert regions where it forms as a secondary mineral in the oxidized zone of copper sulfide mineral deposits. However, the process of its formation is not simple, the oxidation of copper sulfides should be insufficient to crystallize dioptase as silica is normally minutely soluble in water except at highly alkaline pH. The oxidation of sulfides will generate highly acidic fluids rich in sulfuric acid that should suppress silica solubility. However, in dry climates and with enough time, especially in areas of a mineral deposit where acids are buffered by carbonate, minute quantities of silica may react with dissolved copper forming dioptase and chrysocolla

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mineralgemworld
mineralgemworld
MEMBER OF THE [ICA]  INTERNATIONAL COLOURED STONE ASSOCIATION AND PRESIDENT OF THE OPAL ASSOCIATION. We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
Surfers Paradise, Australia
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Bids History (1)
guest189072
Purchased from this seller previously
5 years ago
$20.00

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Shipping Details

Shipping:
$16.00 21 days via Registered Shipping
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Overview

Listing Type : Standard
Product ID : 253613
Starting Bid : $18
Starts : 28th July 2018 04:00 pm AEST
Ends : 29th July 2018 10:11 am AEST
* All prices are in USD