Feldspar also being called common feldspar is the aluminosilicate mineral of alkali metals (such as kalium, natrium, calcium and so on) or alkaline-earth metals.

In addition to serving as the raw material of glass industry (accounts for 50-60% of the total amount), the usage for porcelain industry makes up accounts for 30%, and the other parts can be used in chemical industry, grinding material grinding apparatus, fiber glass, electrode and so on.

Physical property: density 2.56-2.59g/cm3, Mohs hardness 6, clinorhombic system. The feldspar crystals are in the form of prismatical and thick plate. Some have the color of flesh pink, some are colored tawny or ivory, and there are also some colorless and transparent crystals being called adularia.

Chemical constitution: the molecular formula of potash feldspar is K2O . Al2O3 .6SiO2 , its theoretical chemical constitution is K2O 16.9%, Al2O3 18.4%, SiO2 64.7%, always containing a small amount of Na2O. However, in nature, it is hard to reach the theoretical value.That is to say, the feldspar with chamical constitution closer to the theoretical value is purer and has better quality.

Added: 20.08.2007 Offer viewed: 321 (hits)

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