Origin of feldspar
Examples from the Web for feldspar
Feldspar particles have as wide a range of colour as quartz, but it is easy to tell the two apart.
Granite is made of quartz, feldspar, and mica, sometimes with added particles of hornblende.
The feldspar is decomposed with the resulting formation of epidote, which is quite prominent.The Long Labrador Trail|Dillon Wallace
As a result of the decomposition of the feldspar, much clay is formed, the main substance of which is kaolin.Geology|William J. Miller
The substances used as a bond in manufacturing wheels are kaolin, a kind of clay, and feldspar.Electricity and Magnetism|Elisha Gray