from The Century Dictionary.
- noun A variety of rhodonite or manganese silicate, occurring at Cummington, Massachusetts.
- noun An iron-magnesia variety of amphibole from the same locality.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy A
mineral, magnesium- iron silicate hydroxide, (Mg,Fe)7Si8O22(OH)2.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Cummington + -ite, since it was originally discovered in Cummington, Massachusetts.
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