Feldspar
Feldspar
Feldspar (pronounced /ˈfɛldˌspɑːr/) is a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight.
Etymology
The term 'Feldspar' originates from the German words 'Feld' meaning 'field' and 'Spat' meaning 'easily cleaved mineral'.
Types of Feldspar
Feldspars are divided into two main groups:
1. Potassium feldspar - Also known as K-feldspar or K-spar, these include orthoclase (KAlSi3O8), microcline (KAlSi3O8), and sanidine (KAlSi3O8).
2. Plagioclase feldspar - These are a continuous solid solution series of feldspar minerals that range from pure albite (NaAlSi3O8) to pure anorthite (CaAl2Si2O8).
Properties
Feldspars are typically light-colored and have a glassy luster. They have a good cleavage forming flat surfaces, and are hard (6 on the Mohs scale).
Uses
Feldspar is used in the manufacture of glass and ceramics. It is also used as a filler in paints and plastics. In addition, it is used in the production of potash for fertilizers.
Related Terms
External links
- Medical encyclopedia article on Feldspar
- Wikipedia's article - Feldspar
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