CaSO4·2H2OMonoclinic
Alabaster
CaSO4·2H2O
SulfatesChemical FormulaCaSO4·2H2O
Crystal SystemMonoclinic
Mohs Hardness2
Specific Gravity2.32
ColorWhite, translucent
LusterVitreous to pearly
StreakWhite
CleavageOne direction
FractureSplintery
Occurrence
Fine-grained variety of gypsum. Used for carving since ancient times.