Tags: Chemical Substance, Mineral.
Thenardite is an anhydrous sodium sulfate mineral Na2SO4 which occurs in arid evaporite environments. It also occurs in dry caves and old mine workings as an efflorescence and as a crusty deposit around fumaroles. It occurs in volcanic caves on Mt. Etna Italy and was named after the French chemist Louis Jacques Thénard (1777–1826).Thenardite crystallizes in the orthorhombic system and often forms yellowish reddish to grey white prismatic crystals although usually in massive crust deposits.
