potash feldspar

noun

1. any of the feldspar minerals having the composition KAlSi 3 O 8 , as orthoclase.

potash feldspar

1. Potassium feldspar.

Word History and Origins

Origin of potash feldspar¹

First recorded in 1860–65

Example Sentences

Orthoclase, often called common or potash- feldspar.

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The granite which composes the magnificent bare pinnacles and the steep western flank of the Portillo chain, is of a brick-red colour, coarsely crystallised, and composed of orthitic or potash feldspar, quartz, and imperfect mica in small quantity, sometimes passing into chlorite.

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