Am"phi*bole (#), n. [Gr. doubtful, equivocal, fr. to throw round, to doubt: cf. F. amphibole. Hauy so named the genus from the great variety of color and composition assumed by the mineral.] Min.
A common mineral embracing many varieties varying in color and in composition. It occurs in monoclinic crystals; also massive, generally with fibrous or columnar structure. The color varies from white to gray, green, brown, and black. It is a silicate of magnesium and calcium, with usually aluminium and iron. Some common varieties are tremolite, actinolite, asbestus, edenite, hornblende (the last name being also used as a general term for the whole species). Amphibole is a constituent of many crystalline rocks, as syenite, diorite, most varieties of trachyte, etc. See Hornblende.
© Webster 1913.