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Formula: Mn2+2Ce(AsO4)(OH)4
Anhydrous arsenate,
retzian group, manganese-
and cerium- bearing mineral
Specific gravity: 4.15 measured, 4.45 calculated
Hardness: 4
Streak: Light brown
Colour: Chocolate brown to chestnut-brown; brown in transmitted light
Solubility: Easily and completely soluble in hydrochloric acid
Environments:
Retzian is an extremely rare arsenate.
At the type locality, the Moss mine, Filipstad, Värmland, Sweden, retzian-(Ce) occurs in cavities in
dolomite, associated with
braunite, dolomite,
jacobsite, manganite and
pyrochroite
(Mindat).
Retzianite-(Ce) from the Moss Mine -
Image
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