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- Dumortierite
Number of pearls in a row: 53
La couleur arc-en-ciel est le résultat de la réfraction de la lumière sur des inclusions de nanoparticules d'hédenbergite
regular Cleavage: None Polariscope: Opaque (rarely translucent) Refractive index: 1
Treatments that exist to modify aquamarine:
VENDU Améthyste trapiche 13 Moins de 3cm - DumortieriteTrapiche amethyst cabochon. Color: Purple Shape: Oval Size: 33. 64 x 22. 49mm Weight in grams: 8. 48g Carat weight: 42. 40 carat Country of origin: South Africa Gemological information about amethyst: Possible color: Blue mauve, purple, dark magenta, purple magenta Density: 2. 65 Hardness: 7 Crystal system: Trigonal Fracture: Conchoidal Cleavage: None Polariscope: Anisotropic (restores all 90, except in the optical axis) Refractive index: n0: 1. 538
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