Garnet is any of a group of hard, glassy minerals. This group of silicate minerals includes six major types: almandine, andradite, grossularite, pyrope, spessartite, and uvarovite. Garnets are composed of silica and such elements as aluminum, calcium, iron, magnesium, and manganese. They range in color from red, brown, and black to various shades of yellow and green. Crystals of garnet are found in all types of rock, but chiefly in metamorphic varieties (see Metamorphic rock).
Some garnet crystals are used in making jewelry. Red garnet, a gem-quality garnet, commonly includes a mixture of almandine and pyrope. Garnets are also used as abrasives for grinding and polishing. Garnets are found throughout the world. Those of gem quality are mined chiefly in central Europe, Russia, and South Africa.
See also Ruby.
