'Hiddenite' definitions:

Definition of 'hiddenite'

(from WordNet)
noun
A green transparent form of the mineral spodumene used as a gemstone

Definition of 'Hiddenite'

From: GCIDE
  • Hiddenite \Hid"den*ite\, n. [After W. E. Hidden.] (Min.) An emerald-green variety of spodumene found in North Carolina; lithia emerald, -- used as a gem. [1913 Webster]