Explanation
The crystal is in the form of microscopic needle, block, colorless or white, and streak is white. It looks like glass, but it is opaque. It has fast setting speed, slight expansion, large porosity, good plasticity and fire resistance, and can be used as polishing powder, paper filler, gas desiccant, medical gypsum bandage, metallurgy and agriculture.
Classification
Inorganic non-metallic materials -> Cementitious materials and concrete