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Formula: CaBe(AsO4)(OH)
Anhydrous arsenate containing hydroxyl,
herderite group
Specific gravity: 3.4
Hardness: 5
Streak: White
Colour: Colourless, white, grey, dark grey-brown, brownish black, green, pink
Common impurities: Si
Environments:
Bergslagite is a rare arsenate.
At Sailauf, Germany, bergslagite occurs in rhyolite associated with
hematite and muscovite
(HOM).
At the type locality, Långban, Värmland, Sweden, bergslagite occurs as aggregates of elongated crystals in
thin veins in
fine-grained hematite ore, found on mine dumps from a metamorphosed
iron-manganese orebody. It is
associated with
tilasite,
diopside variety schefferite,
manganberzeliite,
svabite,
baryte and calcite
(AM 70.436, Mindat, Webmin).
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