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it is a structurally complex tectosilicate
black obsidian
85mm Weight in grams: 5
03mm Weight in grams: 17
Chrysoprase 40 Tranche it is a structurally complexChrysoprase cabochon. Color: Green Shape: Oval Size: 34. 69 x 21. 04mm Weight in grams: 8. 70g Carat weight: 43. 49 carat Country of origin: Australia Gemological information on chrysoprase: Possible colors: Green Density: Between 2. 57 and 2. 64 Hardness: 6 Crystal system: Trigonal Microcrystalline Fracture: Conchoidal, irregular, splintery Cleavage: Polariscope: Anisotropic Refractive index: Ne: 1. 539 to 1. 545 No: 1. 526 to 1. 535 Birefringence:
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