Explanation
silicate mineral with shelf structure. It often contains a small amount of calcium. Hexagonal crystal system. Short columnar crystal. Grey white, often with light yellow, light red, light green and other colors withering. glass luster, fracture surface shows grease luster. The block with obvious oil luster is called grease stone. Mohs hardness 5.5-6, density 2.56-2.66g/cm3, brittle. Dissolve into a colloidal form in strong hydrochloric acid. It is a typical mineral in alkaline rock and does not coexist with quartze. It mainly occurs in nepheline syenite and pegmatite, coexisting with albite, alkaline amphibole and zircon. It is the raw material of glass and ceramics. It can also be used as the raw material for refining aluminum. Those with beautiful color can be used as gems.
Classification
Natural materials and products -> Mineral materials