Materials handbook.(Feldspar--Microsilica)

Ceramic Industry | January 1, 2004 | Copyright

FELDSPAR. The most common mineral in crystalline rocks. Hardness 6.0-6.5 Mohs, Usually occurs as small grains intimately associated with other minerals, but commercial deposits are obtained from pegmatites. Feldspars form a group of which the principal types are potash spar (orthoclase, microcline), soda spar (albite), lime spar (anodhite), and lime-soda spar (oligoclase, andesine, labradorite and bytownite). They are aluminum silicates of potassium, sodium and calcium.

Feldspars exhibit uneven fracture, and have a vitreous to pearly luster. Colors are generally ...

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