French a brittle boron aluminosilicate mineral with a glassy lustre occurring as prismatic crystals of the trigonal system
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tourmaline(French) a brittle boron aluminosilicate mineral with a glassy lustre, occurring as prismatic crystals of the trigonal system
tourmalinesTOURMALINE, (French) a brittle boron aluminosilicate mineral with a glassy lustre, occurring as prismatic crystals of the trigonal system