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 aluminummineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition amphibole - a mineral or mineral variety belonging to the amphibole group 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 tremolite - a white or pale green mineral (calcium magnesium silicate) of the amphibole group used as a form of asbestos hornblende - a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron |