Add to ORKGCommon Forms/Occurrences: Secondary mineral formed by alteration of magnesium silicates (ie. Olivine and pyroxene) Useful Identification Test: Very soft to the touch, soapy feel Chemical formula: Mg3Si4O10(OH)2 Crystal System: Cryptocrystalline masses Colour: White, gray, pale green, or brown Streak: White Lustre: Nonmetallic (NM); Silky to greasy Cleavage: Poor or absent Fracture: Uneven Hardness: 1 Hardness Search: one Specific Gravity: 2.7 - 2.8%value%value%valu