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cummingtonite
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cummingtonite
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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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History

cummingtonite, an amphibole mineral, an iron and magnesium silicate that occurs in metamorphic rocks. For chemical formula and detailed physical properties, see amphibole (table).

This article was most recently revised and updated by Amy Tikkanen.