MgSO4·7H2OOrthorhombic
Epsomite
MgSO4·7H2O
SulfatesChemical FormulaMgSO4·7H2O
Crystal SystemOrthorhombic
Mohs Hardness2
Specific Gravity1.68
ColorColorless, white, pink
LusterVitreous to silky
StreakWhite
CleavageOne direction
FractureConchoidal
Occurrence
Found in evaporite deposits. Also called Epsom salt. Forms from evaporating mineral water.