Formula: Ca2Mn2+(AsO4)2.2H2O
Hydrated normal arsenate, roselite group
Specific gravity: 3.67
Hardness: 3½
Streak: White
Colour: Colourless, white, pink; colourless in transmitted light
Solubility: Soluble in dilute acids

Metamorphic environments

Brandtite is a rare arsenate containing manganese, found in metamorphosed orebodies.

At the type locality, the Harstigen Mine, and at Långban, Filipstad, Värmland, Sweden, brandtite occurs in a metamorphosed iron-manganese orebody, associated with native lead, sarkinite, flinkite, caryopilite, galena, baryte and calcite (HOM).

At Sterling Hill, New Jersey, USA, brandtite occurs in a metamorphosed stratiform zinc orebody, associated with sarkinite, rhodochrosite, sphalerite, franklinite, willemite, baryte, calcite, chalcopyrite and löllingite (HOM).

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