Agardite

arsenate

baryte

Formulae
agardite-(Ce): CeCu2+6(AsO4)3(OH)6.3H2O
agardite-(La): LaCu2+6(AsO4)3(OH)6.3H2O
agardite-(Nd): NdCu2+6(AsO4)3(OH)6.3H2O
agardite-(Y): YCu2+6(AsO4)3(OH)6.3H2O
Specific gravity: Agardite-(Ce) 3.7, Agardite-(La) 3.65, Agardite-(Nd) 3.72, Agardite-(Y) 3.61 to 3.72
Hardness: 3 to 4 (all)
Streak: Greenish white (all)
Colour: Agardite-(Ce) Light green, yellowish green, Agardite-(La) Grass-green to dull green, yellowish green to intense bluish green, rarely nearly colourless, Agardite-(Nd) Grass-green, greenish, greenish-blue, Agardite-(Y) Bluish green to yellow green
Solubility: Agardite-(Y) is soluble in hydrochloric acid
Environments:

Hydrothermal environments

Agardite-(Ce) is an oxidation product formed on baryte and quartz (Webmin).
Agardite-(La) was found in a fluorite mine associated with quartz, fluorite, bastnäsite-(Ce) and baryte (Mindat).
Agardite-(Y) occurs in the oxidation zone of copper veins or deposits (Mindat).

At the Bou Skour Mine, Ouazazate, Morocco agardite-(Y) occurs in the oxidation zone associated with azurite, malachite, cuprite, native copper and quartz (Dana).

At Laurium, Attica, Greece agardite-(Y) is associated with smithsonite, aurichalcite, hydrozincite and cuproadamite (Dana).

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