|any of a group of hard glassy red, yellow, or green minerals consisting of the silicates of calcium, iron, manganese, chromium, magnesium, and aluminium in cubic crystalline form: used as a gemstone and abrasive. Formula: A3B2(SiO4)3 where A is a divalent metal and B is a trivalent metal|
|[C13: from Old French grenat, from grenat (adj) red, from pome grenate|
|garnet (gär'nĭt) Pronunciation Key
Any of several common red, brown, black, green, or yellow minerals having the general chemical formula A3B2SiO8, where A is either calcium (Ca), magnesium (Mg), iron (Fe), or manganese (Mn) and B is either aluminum (Al), manganese, iron, chromium (Cr), or vanadium (V). Garnet crystals are dodecahedral in shape, transparent to semitransparent, and have a vitreous luster. They usually occur in metamorphic rocks but also occur in igneous and sedimentary rocks.