Staurolite, from Russia, a brown glassy mineral that occurs as hexagonal prisms often twinned in the shape of a cross. It consists of a silicate of al

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Staurolite, from Russia, a brown glassy mineral that occurs as hexagonal prisms often twinned in the shape of a cross. It consists of a silicate of aluminum and iron. The mineral often forms porphyroblasts.

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Keywords: aluminum, hexagonal, iron, metamorphic, mineral, nesosilicate, porphyroblasts, prisms, silicate, specimen, staurolite