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Système cristallin: Amorphe
Diamond shaped Amazonite beads
A savoir: La pietersite est une variété de calcédoine
Carat weight: 93
550 / nm: 1
VENDU Tourmaline Noire 2 Plat facetté Système cristallin: AmorpheBlack tourmaline cabochon. Black Shape: Oval Size: 40. 10 x 29. 10mm Weight in grams: 18. 02g Carat weight: 90. 09 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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