(n.) 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's Revised Unabridged Dictionary
| APA | Webster's. (2011). amphibole. Retrieved September 23, 2026, from http://smartdefine.org/amphibole/definitions/1973261 |
| Chicago | Webster's. 2011. "amphibole" http://smartdefine.org/amphibole/definitions/1973261 (accessed September 23, 2026). |
| Harvard | Webster's 2011, amphibole, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/amphibole/definitions/1973261>. |
| MLA | Webster's. "amphibole" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/amphibole/definitions/1973261> |