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Garnets are a group of silicate minerals, Garnet forms when a sedimentary rock with high aluminium content, such as shale, is metamorphosed. Garnet has a hardness of 6.5 to 7.5 on the Mohs scale. This piece of Lindi Garnet rough from Tanzania weighs 2.98 cts, measures 7x6x5mm and has a viel.