Aluminopyracmonite
Aluminopyracmonite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₃Al(SO₄)₃.
It crystallizes in the hexagonal crystal system (space group R-3). It is a member of the Pyracmonite structural group.
Key properties: specific gravity 2.12; White streak; Vitreous luster; optically uniaxial.
IMA symbol Apyr, IMA status: approved, named in 2012.
A sublimate from medium-temperature (~250º C) gases emanating from an intracrater volcanic fumarole.
It is found associated with Adranosite, mascagnite, alunite, salammoniac.
The name refers to the essential aluminum and chemical analogy with pyracmonite.
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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