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Dominant species
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Thenardite
Chemical
Formula
Na2SO4
Species
Sulfates
Crystal
System
Orthorhombic
Mohs
Scale
2-3
Specific
Gravity
2.67-2.7
Color
White, grayish white, yellowish white, reddish white, brownish white
Streak
White
Luster
Vitreous, Resinous
Refractive
Index
n = 1.471 n = 1.477 n = 1.484
Diaphaneity
Transparent, Translucent
Cleavage
PerfectOn perfect; on fair; on incomplete
Fracture
Irregular/Uneven, Hackly
Crystal Habit:Forms crust-like prismatic aggregates on matrix
Geological Setting:Lakes and playas in arid regions; as efflorescences on soils in arid areas, and in caliche. Also occurs around volcanic fumaroles mixed with alkali halides and sulphates and as an incrustation on recent lavas.
Thenardite3272
Thenardite3272
Thenardite3270
Thenardite3270
Thenardite3269
Thenardite3269
Thenardite3264
Thenardite3264
Thenardite3261
Thenardite3261
Thenardite3257
Thenardite3257
Thenardite3254
Thenardite3254
Thenardite3253
Thenardite3253
Thenardite3249
Thenardite3249

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