Name of mineral : A rock composed primarily of lazurite, calcite, ajd pyrite. Mohs hardness : 5 ~ 6 Refractive index : 1.50~1.67 Specific gravity : 2.75 Weight: 1.26 grams Size (mm) : Diameter 20.2 x H 8.00 Untreated Gem Quality US $500y Index Back Next