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Formula: CeCu2+6(AsO4)3(OH)6.3H2O
Arsenate, mixite group,
cerium-bearing mineral
Crystal System: Hexagonal
Specific gravity: 3.7 measured, 3.775 calculated
Hardness: 3 to 4
Streak: Greenish white
Colour: Light green, yellowish green
Luminescence: Not fluorescent under UV
Solubility: Easily soluble in hydrochloric and nitric acids
Mildly RADIOACTIVE
Environments
Localities
At the type locality, the Clara mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany,
agardite-(Ce) occurs as a secondary mineral in the
oxidation zone of the polymetallic sulphide deposit. It forms acicular crystals up to 0.5 mm long and 0.01 mm thick,
commonly in radiating aggregates, associated with goethite and
cornwallite as oxidation products that formed on
baryte and quartz
(AM 89.1574).
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