Nyholmite
Nyholmite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Cd₃Zn₂(AsO₃OH)₂(AsO₄)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Hureaulite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 4.42; White streak; Vitreous luster.
IMA symbol Nyh, IMA status: approved, named in 2008.
A late-stage secondary mineral in the weathering zone of a Cd-Zn arsenate deposit.
It is found associated with Goldquarryite, lavendulan-sampleite, scorodite-strengite, gypsum.
The mineral was named to honor Sir Ronald Sydney Nyholm (1917–1971), born at Broken Hill, New South Wales, and Chair and Professor of Chemistry, University College, London, from 1955–1971.
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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