Mg3Si4O10(OH)2Monoclinic
Talc
Mg3Si4O10(OH)2
SilicatesChemical FormulaMg3Si4O10(OH)2
Crystal SystemMonoclinic
Mohs Hardness1
Specific Gravity2.75
ColorWhite, gray, green, pink
LusterPearly to greasy
StreakWhite
CleavagePerfect basal
FractureFlexible
Occurrence
Softest mineral on Mohs scale. Found in metamorphic rocks. Used in talcum powder.