Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
{001} perfect; {111} imperfect, may exhibit parting on , {011}
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6