... silicate minerals with layer-structure, and rich in elements of potassium(K), aluminum(Al), magnesium and lithium etc. Dolomite ( ... specific density is 2.7-3.5. Dolomite possesses lots of excellent properties, for example electric insulating, high temperature proof ... be taken as filler, shelter, lubricating substance, a drawing of patterns in plastics, rubber, asbestos products and sealing materials ...