Spodumene - LiAlSi₂O₆

Habit: Colorless, greenish or grayish white, yellowish green, emerald green, yellow, pink or violet; may be bicolor. Crystals prismatic, typically flattened and striated; also commonly massive. Vitreous but pearly on cleavage; transparent to translucent. White streak.

Environment: A common constituent of lithium-rich granite pegmatites and also occurs in aplites and gneisses.

Etymology: From the Greek for "ash-colored," in allusion to its color.