A soft phyllosilicate clay mineral of the smectite group, the main constituent of bentonite. It's known for its swelling and absorbent properties, associated with detoxification, purification, and emotional balance.
White, Grey, Pink, Yellow, Green, Blue, often soft and earthy
Montmorillonite is classified as a phyllosilicates smectite group mineral which typically crystallizes in the monoclinic system. Its chemical formula is (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2·nH2O. Common crystal habits include compact masses of lamellar or globular microcrystalline aggregates.