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Formulae:
retzian-(Nd) Mn2+2Nd(AsO4)(OH)4
retzian-(Ce) Mn2+2Ce(AsO4)(OH)4
retzian-(La) Mn2+2La(AsO4)(OH)4
Anhydrous arsenate with hydroxyl,
manganese-bearing mineral
Specific gravity: 4.15
Hardness: 4
Streak: Light brown
Colour: Chocolate brown to chestnut-brown; brown in transmitted light
Solubility: Soluble in acids.
Environments:
Retzian is an extremely rare arsenate.
At the type locality, the Moss mine, Filipstad, Värmland, Sweden, retzian occurs in cavities in
dolomite, associated with pyrochroite and
jacobsite
(Mindat).
At the Sterling Hill Mine in Ogdensburg, New Jersey, retzian-(Nd) is found with
rhodochrosite,
willemite,
sonolite, calcite,
baryte and
chlorophoenicite in three separate parageneses
(AM 67: 841-845). Retzian-(La) occurs as overgrowth crystals and embedded in light brown
rhodochrosite
in the willemite-franklinite ore
(Webmin).
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