(n.) Mica containing iron and magnesia, generally of a black or dark green color; -- a common constituent of crystalline rocks. See Mica.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). biotite. Retrieved September 22, 2026, from http://smartdefine.org/biotite/definitions/1980442 |
| Chicago | Webster's. 2011. "biotite" http://smartdefine.org/biotite/definitions/1980442 (accessed September 22, 2026). |
| Harvard | Webster's 2011, biotite, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/biotite/definitions/1980442>. |
| MLA | Webster's. "biotite" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/biotite/definitions/1980442> |