Plagioclase feldspar from Edison Butte rhyolite seen at 40x in doubly polarized light. Credit: Erik Klemetti That is a very quick look at how geologists examine rocks, at least using light.

Feldspar is the name of a group of rock-forming minerals which make up as much as 60% of the Earth's crust. Feldspars crystallize from magma in both intrusive and extrusive rocks, and they can ...

Attainment of equilibrium in plagioclase feldspars is severely hampered by the charge linkage between Ca and Al on the one hand and Na and Si on the other hand (Goldsmith): exsolution is governed ...

The plagioclase was the largest segment of the feldspar market by type, accounting for $2,114.1 million or 57.3% of the total market in 2021. It is expected to be the fastest-growing segment going ...

Anorthosites, igneous rocks rich in plagioclase feldspar, are common on the Earth, Moon, and possibly other planets. Though anorthosites are usually not considered to be strongly magnetic ...

Wilfred A. Elders, Mantled Feldspars from the Granites of Wisconsin, The Journal of Geology, Vol. 76, No. 1 (Jan., 1968), pp. 37-49 ...

Granite is a hard, coarse-grained rock making up most of the earth. It consists chiefly of three minerals: quartz, alkali feldspar (which contain alumina and silica) and plagioclase feldspar ...