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GarnetA garnet crystalGeneralCategory MineralChemical formula (or Composition) nesosilicates with the general formula A3B2(SiO4)3IdentificationColor virtually all colorsCrystal habit rhombic dodecahedra or cubicCrystal system IsometricTwinning ?Cleavage NoneFracture conchoidal to unevenMohs Scale hardness 6.5 - 7.5Luster vitreous to resinousRefractive index 1.72 - 1.94Pleochroism only in certain rare varietiesStreak WhiteSpecific gravity 3.1 - 4.3Major varietiesPyrope Mg3Al2Si3O12Almandine Fe3Al2Si3O12Spessartite Mn3Al2Si3O12Andradite Ca3Fe2Si3O12Grossularite Ca3Al2Si3O12Uvarovite Ca3Cr2Si3O12The garnet group of minerals...
