| Garnet ||Subject: Geology|
(a) A group of minerals of formula: A3B2(SiO4)3, where A=
Ca, Mg, Fe+2, and Mn+2, and B = Al, Fe+3, Mn+3, V+3, and Cr.
(b) Any of the minerals of the garnet group, such as the end members almandine (Fe-Al). andradite (Ca-Fe), grossular (Ca-Al), pyrope (Mg-Al), spessartine (Mn-Al). uvarovite (Ca-Cr). and glodmanite (Ca-V).-Garnet is a brittle and transparent to sub transparent mineral, having a vitreous luster, no cleavage. and a variety of colors, dark red being the most common. It occurs as an accessory mineral in a wide range of igneous rocks, but is most commonly found as distinctive euhedral isometric crystals in metamorphic rocks (gneiss, mica schist, eclogite); it may also be massive or granular. Garnet is used as a semiprecious stone and as an abrasive.
| || |