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mocha stone
Il existait au XIXe siècle dans les Alpes des quartz fumés artificiellement au dessus d'un feu de bois)
576 / Ng: 1
Black Shape: Round Size: 36
VENDU Tourmaline Noire 5 quartz fumé mocha stoneBlack tourmaline cabochon. Black Shape: Oval Size: 40. 94 x 27. 08mm Weight in grams: 11. 94g Carat weight: 59. 69 carat Country of origin: Madagascar Gemological information about tourmaline: Density: Between 2. 84 and 3. 40 Hardness: Between 7 and 7. 5 Crystal system: Trigonal Fracture: Subconchoidal to irregular Cleavage: None Polariscope: Anisotropic (restores all 90 except in the optical axis) Refractive index: Ne: 1. 603 to 1. 772 No: 1. 619 to
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