Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO2) in their chemistry. This group includes aluminum silicates of soda, potassium, or lime. It is the single most abundant mineral group on Earth.

Chemical Composition KalSi308 – Potassium Aluminum Silicate
Color Typically off-white or shades of red, orange and brown, occasionally green.
Cleavage One perfect cleavage and one good cleavage that meet at nearly 90°
Hardness 6 (harder than glass)
Specific Gravity 2.6
Luster Crystals are vitreous (glass-like) to porcelaneous (porcelain-like)
Streak white

Used in the manufacture of Glass, Pottery, Ceramics, Vitrified enamels,
Special Electrical porcelain, Wind Plates and Opalescent glass
Ceramic Industry

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