Name of mineral : A rock composed primarily of Lazurite, calcite, and pyrite. Mohs hardness : 5〜6 Refractive index : 1.50〜1.67 Specific Gravity : 2.75 Untreated Gem Quality Size(mm): Diameter 20.2 x H 1.36 Weight: 1.26 grams US $500 宝石辞典もくじ 戻る 次ページ