Color is white, yellow, tan, brown, orange or red. Luster is vitreous to resinous. Crystals are transparent to translucent. Crystal Habits include small prismatic to rounded crystals, but as is most commonly the case, as embedded indistinct grains. Cleavage is poor in one direction, basal.
Fracture is subconchoidal.
Hardness is 6 - 6.5. Specific Gravity is 3.1 - 3.2 Streak is white. Best Field Indicators are color, associations, fluorescence, environment of formation and hardness.