thenardite
noun
the·nard·ite
thə̇ˈnärˌdīt
plural -s
: a mineral Na2SO4 consisting of native anhydrous sodium sulfate and occurring in white or brownish crystals, masses, or crusts often in connection with salt lakes
Word History
Etymology
French thénardite, from Baron Louis J. Thénard †1857 French chemist + French -ite