Definition of hiddenite in English:

hiddenite

noun

  • [mass noun] A rare green gem variety of spodumene (an aluminosilicate mineral).

    • ‘It is well known as a common constituent of what appear to be alpine-cleft-type pockets that locally contain emerald and spodumene (the variety hiddenite) in Alexander County.’
    • ‘This type of pegmatite, or one closely allied to it, also contains hiddenite as hypidiomorphic crystals within the pegmatite itself.’

Origin

Late 19th century: named after William E. Hidden (1832–1918), American mineralogist.

Pronunciation:

hiddenite

/ˈhɪd(ə)nʌɪt/