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.
Description
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.
Associates
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.

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