Howardevansite
Howardevansite is an IMA-recognized mineral species in the vanadate class, with the chemical formula NaCu²⁺Fe³⁺₂(VO₄)₃.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Howardevansite structural group.
Key properties: specific gravity 3.814; Red-brown streak; Metallic luster.
IMA symbol Hdv, IMA status: approved, named in 1987.
Forms by sublimation around fumaroles on an andesitic volcano.
It is found associated with Thenardite, lyonsite.
The mineral was named to honor Dr. Howard Tasker Evans, Jr. (1919–2000), American mineralogist and crystallographer, U.S. Geological Survey, Reston, Virginia, USA.
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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