Habit: prismatic, massive, granular, blocky.
Color: white, pink, yellow, or red.
Diaphaneity: transparent to translucent.
Luster: pearly, vitreous (i.e., glassy).
Streak: white.
Cleavage: (001) perfect, (010) good, (110) poor.
Twinning: Carlsbad [001],
Baveno [021].
Fracture: uneven.
Occurrence: intrusive and extrusive igneous, and
metamorphic rocks.
