Perles en améthyste facettées entre 2 et 4mm Perle décorative Treatments that exist to modify

Treatments that exist to modify labradorite:

Different countries where lapis lazuli can be mined: Afghanistan

Rhodonite beads

Crystal system: Trigonal / Hexagonal (Rhombohedral)

Perles en améthyste facettées entre 2 et 4mm Perle décorative Treatments that exist to modifyFaceted amethyst beads. Color: Purple Sizes between 2 and 4mm Country of origin: Brazil 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 ne: 1. 547 to 1. 553 Birefringence: 0. 009 Chelsea Filter: Inert