mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition

amphibole group - a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum

amphibolite - a metamorphic rock composed chiefly of amphibole and plagioclase

nephrite - an amphibole mineral consisting of calcium magnesium silicate in monoclinic crystalline form; a source of jade that is less valuable than from jadeite; once believed to cure kidney disorders

actinolite - a green mineral of the amphibole group; calcium magnesium iron silicate

anthophyllite - a dark brown mineral of the amphibole group; magnesium iron silicate

asbestos - a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer

hornblende - a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron