Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of several varieties of alkali feldspar, including sanidine, orthoclase, microcline, and adularia, that contain a high proportion of potassium relative to sodium.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy Any of several
alkaline feldspars containing potassium aluminium silicate, KAlSi3O8
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