Spodumene is a pyroxene mineral consisting of lithium aluminium inosilie, Li Al(Si O 3) 2, and is a source of lithium occurs as colorless to yellowish, purplish, or lilac kunzite (see below), yellowishgreen or emeraldgreen hiddenite, prismatic crystals, often of great size.Single crystals of 14.3 m (47 ft) in size are reported from the Black Hills of South Dakota, United States.