Davidlloydite
Davidlloydite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Zn₃(AsO₄)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Parahopeite structural group.
Key properties: Mohs hardness 3–4; specific gravity 3.661; White streak; Vitreous to opalescent luster; optically biaxial.
IMA symbol Dld, IMA status: approved, named in 2011.
Secondary in the oxidation zone of a Cu-Pb-Zn mineral deposit.
It is found associated with Calcioandyrobertsite, stranskiite, geminite, adamite-olivenite.
The mineral was named to honor David Lloyd (b. 1943), a British mineral collector who was a prime mover in the re-opening of the Tsumeb mine for mineral collecting.
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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