tourmaline: a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones
mineral: solid homogeneous inorganic substances occurring in nature having a definite chemical composition
bastard toadflax: woody creeping parasite of western North America having numerous thick powdery leaves and panicles of small dull-white flowers