VENDU Tourmaline Noire 5 arbre Poids en carat: 55

Poids en carat: 55

irregular to splintery Cleavage: 2 cleavages at more or less 90° Polariscope: Anisotropic (difficult to observe) Refractive index: Np: 1

Different countries where rhodochrosite can be mined: United States

Gemological information about lapis lazuli:

VENDU Tourmaline Noire 5 arbre Poids en carat: 55Black tourmaline cabochon. Black Shape: Oval Size: 40. 94 x 27. 08mm Weight in grams: 11. 94g Carat weight: 59. 69 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