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nepheline

[nef-uh-lin]
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noun
  1. a feldspathoid mineral, essentially sodium aluminum silicate, NaAlSiO4, occurring in alkali-rich volcanic rocks.
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Also neph·e·lite [nef-uh-lahyt] /ˈnɛf əˌlaɪt/.

Origin of nepheline

1805–15; < French néphéline, equivalent to néphél- (< Greek nephélē cloud) + -ine -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for nepheline

nepheline

nephelite (ˈnɛfɪˌlaɪt)

noun
  1. a whitish mineral consisting of sodium potassium aluminium silicate in hexagonal crystalline form: used in the manufacture of glass and ceramics. Formula: (Na,K)(AlSi) 2 O 4
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Word Origin

C19: from French néphéline, from Greek nephelē cloud, so called because pieces of it become cloudy if dipped in nitric acid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012