Mereiterite
Mereiterite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₂Fe²⁺(SO₄)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 2.5–3; specific gravity 2.36; Vitreous to greasy luster; optically biaxial.
IMA symbol Mtr, IMA status: approved, named in 1993.
A rare secondary mineral imbedded in gypsum, formed by decomposition of sulfides in a hydrothermal Pb–Zn–Cu ore deposit.
It is found associated with Gypsum, smithsonite, goethite.
The mineral was named to honor Dr. Kurt Helmut Mereiter (1945–), Professor of Mineralogy, Technical University of Vienna, Vienna, Austria, in recognition of his work on iron sulfates.
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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