Yavapaiite
Yavapaiite is an IMA-recognized mineral species in the sulfate class, with the chemical formula KFe³⁺(SO₄)₂.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 2.5–3; specific gravity 2.88; White to pale yellow streak; Vitreous to nearly adamantine luster; optically biaxial.
IMA symbol Yav, IMA status: approved, named in 1959.
Found in the fire zone of a pyritic orebody, formed under fumarolic conditions.
It is found associated with Voltaite, sulfur, jarosite.
The name refers to the Yavapai Indian tribe who inhabit the region around Jerome, Arizona, 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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