Dimensions (mm) | not provided |
Weight (carats) | not provided |
Colors | |
Certified Gemstone |
SEDA GEMS
RARE DIOPTASE
This is a natural untreated specimen of Dioptase on its natural matrix from Kazakhstan
Great specimen.
Weight 96.38 cts app
Size 33x28x15 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
Belle rubellite, parfaitement conforme à la description
I love these little stones. They are adorable and will make nice jewelry.
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Request AuditAuction ID | 362136 |
Watchers | 4 watching |
Viewed | 1,257 times |
Starts | 7th May 2013 9:44pm PDT |
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