Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mineral, magnesium-iron silicate hydroxide, (Mg,Fe)7Si8O22(OH)2.

from The Century Dictionary and Cyclopedia

  • n. A variety of rhodonite or manganese silicate, occurring at Cummington, Massachusetts.
  • n. An iron-magnesia variety of amphibole from the same locality.

Etymologies

Cummington +‎ -ite, since it was originally discovered in Cummington, Massachusetts. (Wiktionary)

Examples

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