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Informations gemmologiques sur la séraphinite:
can even go as far as light blue
La chrysoprase peut-être confondue avec:
variété de microcline
VENDU Tourmaline Noire Druzy 11 facettes Informations gemmologiques sur la séraphinite:Black tourmaline druzy cabochon. Black Shape: Oval Size: 37. 62 x 24. 68mm Weight in grams: 16. 97g Carat weight: 84. 84 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.
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