Explanation
Island structure silicate mineral. The chemical formula is Ca10 (Mg, Fe) 2Al4 [SiO4] 5 [Si207] 2 (OH, F) 4. Tetragonal crystal system, short columnar crystal. Yellow brown, green when containing chromium, reddish brown or pink when containing titanium and manganese, and green blue when containing copper. glass luster, Mohs hardness 6.5-7, brittle, density 3.33-3.43g/cm3.
Classification
Natural materials and products -> Mineral materials