National Minerals Information Center

Feldspar Statistics and Information

Close up of Feldspar

Mineral: Feldspar
Primary Commodity: Feldspar
Primary Commodity Uses: Feldspar is one of the most common minerals on the planet and is mostly used for glassmaking and ceramics.

(Credit: Scott Horvath, USGS. Public domain.)

Feldspars are aluminosilicates containing varying amounts of calcium, potassium, or sodium.  In glassmaking, feldspar provides alumina for improving hardness, durability, and resistance to chemical corrosion.   In ceramics, feldspar is used as a flux, lowering the vitrifying temperature of a ceramic body during firing and forming a glassy phase.   Glass and ceramics continued to be the major end uses of feldspar.

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Joyce Ober

Supv. Physical Scientist
Phone: 703-648-7717