what is feldspar used for
The name feldspar derives from the German Feldspat, a compound of the words Feld, field, and Spat, a rock that does not contain ore . The change from Spat to-spar was influenced by the English word spar, a synonym for mineral. Feldspathic refers to materials that contain feldspar.eldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber. In glassmaking, alumina from feldspar improves product hardness, durability, and resistance to chemical corrosion.