Huizingite-(Al)
Huizingite-(Al) is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₉Al₃(SO₄)₈(OH)₂·4H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2.5; specific gravity 2.026; White streak; Vitreous luster; optically biaxial.
IMA symbol Hui-Al, IMA status: approved, named in 2015.
Formed by a natural fire in oil-bearing shale exposed along a cliff.
It is found associated with Adranosite-(Al), anhydrite, boussingaultite, mascagnite, salammoniac.
The mineral was named to honor Terry E. Huizing (born 1938) and Marie E. Huizing (born 1939) of Cincinnati, Ohio, 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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