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43 Hardness: Between 5 and 6 Crystal system: Orthorhombic Breakage: Uneven Cleavage: Good Polariscope: Anisotropic (restores every 90°) Refractive index: Np: 1
38 carat Country of origin: Mali Gemological information about prehnite: Possible colors: Colorless
Namely: A variety of syenite or augite monzonite consisting of diamond-shaped ternary feldspars (with a Schiller effect)
Sizes: Approx 5 x 8mm
blue apatites from Madagascar are systematically heated no matter what you are told
Fluorite 54 pierre de lune multicolore 43 Hardness: Between 5 andCabochon en fluorite. Couleurs: Violet et vert Forme: Ovale Taille: 36,01 x 22,17mm Poids en gramme: 11,66g Poids en carat: 58,33 carat Pays d'origine: Chine Informations gemmologiques sur la fluorite: Couleur possible: Bleu, brun, orange, rose Densit: Entre 3,18 et 3,25 Duret: 4 Systme cristallin: Cubique Cassure: Conchodale, irrgulire, fragile Clivage: Suivant les faces de l'octadre Polariscope: Isotrope, ne rtablit pas ou anomalies de polarisation
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