Explanation

Sulfate minerals with complex island like structures. The chemical formula is K2Mg2 [SO4]. Equiaxed crystal system. The crystal are granular, and the aggregates are granular, tubercular, kidney shaped, etc. Colorless, sometimes appearing in shades of light yellow, light red, light green, etc. Transparent, glass luster. Mohs hardness 3.5~4, brittle, density 2.83g/cm3, piezoelectricity. It slowly dissolves in water, absorbs water quickly in air and decomposes into soft potassium magnesium alum and epsomite. It is produced in salt lakes and is a chemical deposition product, coexisting with halite, anhydrous sodium magnesium alum, aphthitalke, etc. It is a raw mineral material for extracting potassium.

Classification