cummingtonite

cummingtonite

[kuhm-ing-tuh-nahyt]
noun
an amphibole mineral, magnesium-iron silicate, similar in composition to anthophyllite but richer in iron.

Origin:
named after Cummington, Mass., where it is found; see -ite1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

cummingtonite

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

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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