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cummingtonite

American  
[kuhm-ing-tuh-nahyt] / ˈkʌm ɪŋ təˌnaɪt /

noun

  1. an amphibole mineral, magnesium-iron silicate, similar in composition to anthophyllite but richer in iron.


Etymology

Origin of cummingtonite

Named after Cummington, Mass., where it is found; see -ite 1

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