රබහ General Category Nesosilicate රසායනික සූත්‍රය The general formula X3Y2(SiO4)3 Identification පාට / පැහැය virtually all colors Crystal habit Rhombic dodecahedron or cubic Crystal system Cubic rhombic dodecahedron, icositetrahedron Cleavage Indistinct Fracture conchoidal to uneven Mohs scale hardness 6.5–7.5 Luster vitreous to resinous Streak White Specific gravity 3.1–4.3 Polish luster vitreous to subadamantine[1] Optical properties Single refractive, often anomalous double refractive[1] Refractive index 1.72–1.94 Birefringence None Pleochroism None Major varieties Pyrope Mg3Al2Si3O12 Almandine Fe3Al2Si3O12 Spessartine Mn3Al2Si3O12 Andradite Ca3Fe2Si3O12 Grossular Ca3Al2Si3O12 Uvarovite Ca3Cr2Si3O12 ↑ උපන්‍යාස දෝෂය: අනීතික <ref> ටැගය; GRG නමැති ආශ්‍රේයන් සඳහා කිසිදු පෙළක් සපයා නොතිබුණි