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cummingtonite

[kuhm-ing-tuh-nahyt] /ˈkʌm ɪŋ təˌnaɪt/
noun
1.
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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for cummingtonite

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

Learn more about cummingtonite with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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