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Minerals of Garnet Group

The garnets comprise a group of isomorphous minerals with the general formula X3Y2(SiO4), where X may be Ca, Mg, Mn, or Fe+2 and Y may be Al, Cr3+. The common garnets are: Pyrope: Al2Mg3O12Si3: Red to Purple with a hardness 7-7.5 on Moh’s scale. Almandine: Fe++3Al2(SiO4)3:┬áRed brown in colour, and has a hardness 7-7.5 on …