Liskeard Cornwall, England — Photo: Pacific Museum of Earth from Canada · CC BY-SA 2.0
Liskeardite
Liskeardite is an IMA-recognized mineral species in the arsenate class, with the chemical formula (Al,Fe)₃₂(AsO₄)₁₈(OH)₄₂(H₂O)₂₂·52H₂O.
It crystallizes in the monoclinic crystal system (space group I2).
Key properties: optically biaxial.
IMA symbol Lsk, grandfathered status — known before the IMA’s founding, named in 1878.
An oxidation product of arsenic-bearing sulfides.
It is found associated with Scorodite, arsenopyrite, chalcopyrite, pyrite, quartz (Liskeard, England).
The name refers to its first-noted occurrence, near Liskeard, England.
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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