Mineral description : Valleriite

Mineral class	Sulphides : Chalcocite group
Chemical formula	4(Fe,Cu)S.3(Mg,Al)(OH)2
Crystal system	Hexagonal
Habitus	Massive nodules, up to cm in size, tiny splinters, thin flakes or crusts.
Cleavage	{001} excellent.
Hardness	1 or less, less than graphite.
Density	3.14
Color	Bronce yellow, like pyrrhotine.
Streak
Luster	Dull metallic, opaque.
Description
Occurance	As an alteration product of chalcopyrite or other copper minerals. Often in rocks gone through contact metamorphose.
Associates	Chalcopyrite, cubanite, magnetite, serpentinite.
Notes	Named after the Swedish mining geologist Göran Wallerius (1683 - 1742).
Localities	A not so common mineral Sweden : Aurora mine, Ljusnarsberg, Västmanland. Kaveltorp, Kopparberg. Tunaberg, Södermanland. Boliden, Västerbotten. As microscopical grains in chalcopyrite. Lainijaur, Lappland. As microscopical grains in chalcopyrite. Stekenjokk, Lappland. As microscopical grains in chalcopyrite. Norway : Known from a number of small sulphide deposits in the Kaledonides. Jakobsbakken mine, Sjulitelma. As lamellae in chalcopyrite. Birtavarre, Troms. As small flakes or microscopic veins between grains of chalcopyrite. Finland : waiting for data.

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