The main component of magnesite is magnesium carbonate(MgCO3 ),
Hardness is between 3.5 and 5. Origin is in Zimbabwe, Brazil, Australia and China. Magnesite is not easy to form a good crystal, usually in the shape of rock.
Applications: refractory materials, building materials,
Chemical materials, and refine metal magnesium and magnesium compounds.
Talc is hydrothermal alteration minerals, the rich magnesite often becomes talc by hydrothermal alteration. Talc is a kind of common silicate mineral, it's very soft and has a smooth hand feel. The talc has a lot of applications, such as refractory material, papermaking, rubber filler, pesticide absorber, leather coating, cosmetic and sculpture material.
Potassium feldspar ore is high volume, most widely distributed, the largest reserves of non-water soluble potassium resources. Mainly used in glass, ceramics, also used for making fertilizer, better quality of K-feldspar is used for manufacturing TV imaging and glass bulb.