alkali feldspar

Any of several feldspar minerals containing alkali metals and little calcium. Plagioclase, orthoclase and microcline are alkali feldspars.

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a granular metamorphic rock.
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Words nearby alkali feldspar

alkalemia, alkalescent, alkali, alkali blue, alkali denaturation test, alkali feldspar, alkali flat, alkali grass, alkali metal, alkali metaprotein, alkali reserve
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.