Both anatase and brookite belong to the oxide minerals of titanium, which are two homogenous and polymorphic variants of rutile minerals. Anatase is a very rare mineral. Its composition often contains impurities such as ferric oxide and tantalum, ไนโอเบียม, tin, and manganese. It belongs to the tetragonal crystal system. Transparent to opaque, hardness is 5.5-6.0. […]
