Feldspar used in a sentence

Feldspar in a sentence as a noun

The K is mostly contained in alkali feldspar and mica.

Granite, by the way, is composed of different materials, such as, for example, feldspar and quartz.

" Rocks that are on the surface get weathered and eroded; quartz and feldspar on exposed granite become successive layers of sandstone.

Rarely is it made into jewelry, usually only as an inclusion into another mineral such as quartz or feldspar.

I would guess not, otherwise it would exist in nature"Moonstone sometimes exhibits red-orange coloration due to its structure of alternating layers of different types of feldspar.

Whereas magmas at mid-ocean ridges become enriched in iron because of the crystallisation of plagioclase feldspar, at subduction zones the presence of water suppresses feldspar crystallisation, instead producing 'wet' minerals like amphibole.