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Formula: Mn2+2La(AsO4)(OH)4
Anhydrous arsenates with hydroxyl,
retzian group,
manganese- and lanthanum- bearing mineral
Specific gravity: 4.49 calculated
Hardness: 3 to 4
Streak: Light brown
Colour: Dark reddish-brown
Environments:
At the type locality, the Sterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA, retzian-(La) occurs
as overgrowth crystals and embedded in light brown
rhodochrosite
in the willemite-franklinite ore
(Webmin).
Other associated minerals include todorokite and
calcite
Mindat
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