Item Information

Dimensions (mm) not provided
Weight (carats) not provided



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

Great specimen.

Weight 98.40 cts app

Size 37 x 29 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

1d 1h 32m 12s

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Pricing & Details

Bid Increment $1.00
Starting Bid $30.00
Auction ID 253692
Watchers 1 watching
Viewed 465 times
Starts 26th Oct 2016 6:02pm PDT
Ends 29th Oct 2016 6:00pm PDT

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