a mineral, sodium sulfate, Na2SO4, occurring in white crystals and masses, especially in salt lakes and arid regions.
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British Dictionary definitions for thenardite
a whitish vitreous mineral that consists of anhydrous sodium sulphate and occurs in saline residues. Formula: Na 2 SO 4
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