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Description : Chrysoprase
Local Name : krisopal
Location : buton regency, south eastern Sulawesi
Hardness: 7 Mohs
Age: Permo - Triassic(App.240 million years)
Dimension :
8.3 x 3.7 x 1.8 cm
Weight :
95 gr
Geology :
Chrysoprase is cryptocrystalline, which means that it is composed of crystals so fine that they cannot be seen as distinct particles under normal magnification. This sets it apart from rock crystal,amethyst,citrine, and the other varieties of crystalline quartz. Other members of the cryptocrystalline silica family includeagate,carnelian, andonyx. Unlike many non-transparent silica minerals, it is the color of chrysoprase, rather than any pattern of markings, that makes it desirable. The word chrysoprase comes from theGreekχρυσόςchrysosmeaning \'gold\' and πράσινονprasinon, meaning \'green\'.
Unlikeemeraldwhich owes its green color to the presence ofchromium, the color of chrysoprase is due to trace amounts ofnickelcompounds in the form of very small inclusions. The nickel reportedly occurs as different silicates, likekeroliteorpimelite(not NiO mineral,bunsenite, as was reported before). Chrysoprase results from the deep weathering orlateritizationof nickeliferousserpentinitesor otherultramaficophioliterocks. In the Australian deposits, chrysoprase occurs as veins and nodules with browngoethiteand otheriron oxidesin themagnesite-richsaprolitebelow an iron and silica cap.
As with all forms ofchalcedony, chrysoprase has a hardness of 6–7 on theMohs hardness scaleand a conchoidal fracture likeflint.
The best known sources of chrysoprase areIndonesia,Queensland,Western Australia, andBrazil. Deposits in centralTanzaniahave been in constant production since 1986. The chrysoprase and nickel silicate ore deposit inSzklary,Lower Silesia,Poland, was probably the biggest European chrysoprase occurrence and possibly also the biggest in the world
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