Mineral description : Anhydrite

Anhydrite from Sulitjelma, Norway.

Mineral class Sulphates : anhydrite - gypsum
Chemical formula Ca(SO4)
Crystal system Orthorombic
Habitus Crystals as orthorombic dipyramidals. Also as fibric aggregates and in cleavable masses.
Cleavage Perfect, uneven to splintery fracture.
Hardness 3-3.5
Density 2.98
Color White, grey, bluish to pinkish reddish or brownish.
Streak White
Luster Vitreous, pearly or greasy.
Occurance Commonly found as evaporites with dolomite, calcite, gypsum, halite and sylvite. Rarely as a hydrothermal mineral.
In Sweden in some weathered sulphide ores (mullmalmer) and some mines in Lappland.
Notes Transforms into gypsum.
Locations A rare mineral in Sweden.
  • Falu mine, . In weathered ore.
  • Kristineberg, Lappland. In massive aggregates with pyrite and as veins in other rocks.
  • Sulitjelma, Norway.

To sulphate index.
Mineral group index.
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Last changed : 2004-01-28