Formula: Ca2Mn2+(AsO4)2.2H2O
Hydrated arsenate,
roselite group,
manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.67 measured, 3.7 calculated
Hardness: 3½
Streak: White
Colour: Colourless, white, pink; colourless in transmitted light
Solubility: Soluble in dilute acids
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).
Back to Minerals