Cummingtonite

//ˈkʌm.ɪŋ.təˌnaɪt// noun

noun ·Rare ·Advanced level

Definitions

Noun

1
A mineral, magnesium-iron silicate hydroxide, (Mg,Fe)₇Si₈O₂₂(OH)₂. countable, uncountable

Etymology

From Cummington + -ite, since it was originally discovered in Cummington, Massachusetts.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.