Color is colorless or white. Luster is vitreous. Crystals are translucent. Crystal Habits include acicular crystals and massive forms. Cleavage is poor and rarely seen.
Fracture is uneven.
Streak is white. Associated Mineral is commonly spurrite . Notable Occurrences include Crestmore, Riverside Co., California and Paterson, New Jersey, USA and Langban, Sweden. Best Field Indicators are density, hardness and association.