French an orthorhombic borosilicate of aluminium occurring as small violet or blue needles or fibrous masses esp in gneisses and schists
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dumortierite(French) an orthorhombic borosilicate of aluminium occurring as small violet or blue needles or fibrous masses esp in gneisses and schists
dumortieritesDUMORTIERITE, (French) an orthorhombic borosilicate of aluminium occurring as small violet or blue needles or fibrous masses esp in gneisses and schists
dumortieriteA rare blue or violet mineral occurring typically as needles and fibrous masses in gneiss and schist. It consists of an aluminum and iron borosilicate