Name of mineral :Opal Mohs hardness : 5〜6 1/2 Refractive index : 1.450 Specific gravity :2.15 Weight :4.55 ct Size (mm) : L 14.6×W 9.6×D 3.60 untreated Gem quality us $2,500 宝石辞典もくじ 戻る 次ページ