Feldspar is the most common rock-forming mineral (about 60% of the earth’s crust). The word "feld" is "field" in German and "spar" is a term for light colored minerals that break with a smooth surface. Feldspar Dark minerals are usually dark in colour, it have a hardness of around of 6 on the Mohs’ Scale of Hardness and perfect to good cleavage (plane of breakage) in two directions.

/// Uses

Uses: Feldspar is used in the manufacture of glass products, in ceramics and other products . Feldspar is an important ingredient in the manufacture of glass. The raw material for glass consists of silica sand, soda ash (sodium carbonate) and limestone (calcium carbonate). Feldspar adds certain qualities to the process.

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