Plumboagardite
Plumboagardite is an IMA-recognized mineral species in the arsenate class, with the chemical formula (Pb,REE,Ca)Cu₆(AsO₄)₃(OH)₆·3H₂O.
It crystallizes in the hexagonal crystal system (space group P6_3/m). It is a member of the Mixite structural group.
Key properties: Mohs hardness 3; specific gravity 3.471; Greenish streak; Vitreous luster; optically uniaxial.
IMA symbol Pagr, IMA status: approved, named in 2003.
Formed in the oxidized zone of hydrothermal Pb-Zn vein deposits, the product of alteration of primary Pb, Cu, REE, and As minerals.
It is found associated with Fluorite, limonite, chrysocolla, quartz.
As the lead (plumbo) analog of agardite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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