A mineral of a white to yellowish, purplish, or emerald-green color, occurring in prismatic crystals, often of great size. It is a silicate of alumina and lithia. See Hiddenite.

a pyroxene mineral consisting of lithium aluminum silicate; a source of lithium

LiAlSi. A rare mineral found in pegmatites. The gemmy green variety is hiddenite, the pink to violet variety is kunzite. See also the field guide entry for spodumene.