Trisha Shetty (Editor)

Thenardite

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Category
  
Sulfate mineral

Strunz classification
  
7.AC.25

Space group
  
Fddd

Formula (repeating unit)
  
Na2SO4

Crystal system
  
Orthorhombic


Crystal class
  
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

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 sublimate deposit around fumaroles. It occurs in volcanic caves on Mt. Etna, Italy. It was first described in 1825 for an occurrence in the Espartinas Saltworks, Ciempozuelos, Madrid, Spain and was named for the French chemist, Louis Jacques Thénard (1777–1826).

Thenardite crystallizes in the orthorhombic system and often forms yellowish, reddish to gray white prismatic crystals although usually in massive crust deposits. Thenardite is fluorescent, white in shortwave and yellow-green in longwave UV radiation.

In humid conditions, thenardite gradually absorbs water and converts to the mineral mirabilite, Na2SO4·10H2O.

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Thenardite FileThenarditemrz305ajpg Wikimedia Commons

Thenardite FileThenarditeMirabilite193801jpg Wikimedia Commons

Thenardite Thenardite Wikipedia

Thenardite Thnardite Wikipdia

References

Thenardite Wikipedia


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