Carlsonite
Carlsonite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₅Fe³⁺₃O(SO₄)₆·7H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Metavoltine structural group.
Key properties: Mohs hardness 2; specific gravity 2.167; Tan streak; Vitreous luster; optically biaxial.
IMA symbol Csn, IMA status: approved, named in 2014.
Formed by a natural fire in oil-bearing shale exposed along a cliff.
It is found associated with Anhydrite, boussingaultite, gypsum, lonecreekite.
The mineral was named to honor Ernest H. Carlson (1933-2010), Professor of Mineralogy, Kent State University, Ohio, USA and author of Ohio Geological Survey Bulletin 69, Minerals of Ohio (1991).
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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