History Signifiance :

Feldspar has been used in ceramics in China since the Tang Dynasty and in Europe since the 18th century. United States first mined Feldspar in 1825 in Connecticut and was shipped to England for use in ceramics. In 1911, Feldspar was discovered in Mitchell County, North Carolina where they became the major producer. In the 1930's California became the main producer of Feldspar.

Feldspar is a name for a group of anhydrous aluminum silicate minerals which contain varying amounts of Potassium, Sodium and Calcium. These are the most abundant minerals in the Earth's crust. Feldspar fuses at lower temperatures than other ingredients. It acts as flux by wetting the solid particles and the surface tension pulls them together. It also increases strength, toughness and durability. 50% of glass is made up of Feldspar, 30% in ceramics, 4% in enamel and 11% in soap.