Physical properties
Habit: blocky, crystalline, coarse, prismatic.
Color: white, cream, bright green, or green.
Diaphaneity: translucent to transparent.
Luster: vitreous (i.e., glassy).
Cleavage: (001)
perfect, (010) good.
Twinning: albite [010], pericline [010].
Fracture: uneven.
Streak: white.
Occurrence: granitic pegmatites, hydrothermal and metamorphic rocks.
