Lapeyreite
Lapeyreite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Cu₃O[AsO₃(OH)]₂·H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: specific gravity 4.3; Yellowish green streak; Vitreous to adamantine luster; optically biaxial.
IMA symbol Lpy, IMA status: approved, named in 2003.
Found as a secondary mineral in geodes of cuprite in a weathering zone.
It is found associated with Trippkeite, olivenite, malachite, gilmarite, cornubite, connellite, theoparacelsite, brochantite, cuprite, native copper, algodonite, domeykite.
The mineral was named to honor Laurent Lapeyre (b. 1973), the mineral collector who found the mineral.
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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