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anorthoclase
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Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
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Related Topics:
alkali feldspar
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anorthoclase

mineral
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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History

anorthoclase, any member of a continuous series of feldspar minerals related to sanidine (q.v.).