Definitions

from The Century Dictionary.

  • noun A silicate of zinc and calcium (Ca2ZnSi2O7) which occurs in white granular masses at Franklin Furnace, in Hardyston township, Sussex county, N. J.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A rare purple fluorescent silicate mineral.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Hardystone +‎ -ite, after Hardystone Township, New Jersey.

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