potassium feldspar

American  

noun

1. Geology. any of several types of alkali feldspar having a crystal lattice that is relatively high in potassium.

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potassium feldspar Scientific  

1. A type of alkali feldspar that contains a high proportion of potassium relative to sodium. Microcline and orthoclase are types of potassium feldspar.

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Example Sentences

Granite commonly has large amounts of salmon pink potassium feldspar and white plagioclase crystals that have visible cleavage planes.

From Textbooks • Jan. 1, 2017

During the ore-forming process, some of the original minerals in these rocks are altered to potassium feldspar, biotite, epidote, and various clay minerals.

From Textbooks • Jan. 1, 2015

As cooling continues, the various reactions on the discontinuous branch will proceed because silica is abundant, the plagioclase will become increasingly sodium-rich, and eventually potassium feldspar and quartz will form.

From Textbooks • Jan. 1, 2015