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Garnets typically forms 12 or 24 sided crystals, and range in color from red to pruple, green, yellow, brown, white, and clear. Hardness 6.5 - 7.5; no cleavage; conchoidal fracture.
This specimen is a porphoroblast (a mass of crystal looking like an igneous porphyry, but produced by metamorphism) of red garnet surrounded by amphibole (rock = amphibilite). The mass may look like it has mineral cleavage running from left to right, but it is metamorphic rock cleavage.