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L'obsidienne noire peut-être confondue avec:
Iolite can be confused with:
Hardness: between 5
Système cristallin: Triclinique
Perles en améthyste Ovale L'obsidienne noire peut-être confondue avec:Amethyst beads. Color: Light purple Sizes: 30 60mm Country of origin: Brazil Weight of one row: Approx: Approx 256g Number of beads in a row: 35 beads 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 to 1. 544
