Who can provide classification of non-metallic minerals?!
Chemical raw materials (23): natural pyrite, sulfur, phosphorus, potassium, alunite, chemical limestone, peat, salt, Glauber's salt, boron, arsenic, barite, potassium feldspar, potassium fertilizer, serpentinite, sodium nitrate, natural soda, salt, bromine, magnesium fertilizer with olive rock, iodine, witherite, silica fertilizer.
Special class (7): piezoelectric crystal, Iceland, diamond, blue asbestos, melting crystal, optical fluorite, optical crystal.
Metallurgical auxiliary materials (10): Limestone flux, silica, dolomite, magnesite, refractory clay, fluorite, casting sand, clay, bauxite, casting of high aluminum mineral raw materials.
