Aluminocoquimbite
Aluminocoquimbite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Al₂Fe₂(SO₄)₆(H₂O)₁₂·9H₂O.
It crystallizes in the hexagonal crystal system (space group P-31c). It is a member of the Coquimbite structural group.
Key properties: specific gravity 2.03; White streak; Vitreous luster; optically uniaxial.
IMA symbol Acoq, IMA status: approved, named in 2009.
A precipitate from volcanic vapors in a fumarole (< 100° C).
It is found associated with Alunogen, coquimbite, krausite, tamarugite, yavapaiite, voltaite, pertlikite, pickeringite, metavoltine.
The name refers to its high aluminum content and relation to coquimbite.
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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