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cummingtonite

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

named after Cummington, Mass., where it is found; see -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018