Really outstanding piece of the extremely rare kollerite (IMA 2018-131) from the type locality in Hungary (Pécs-Vasas, Pécs, Mecsek Mountains, Baranya County). First confirmed ammonium sulfate(IV) (sulfite) mineral. Ex. Erich Laskowski collection. — Photo: David Hospital · CC BY-SA 4.0
Kollerite
Kollerite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₂Fe³⁺(SO₃)₂(OH)·H₂O.
It crystallizes in the orthorhombic crystal system (space group Cmcm).
IMA symbol Klr, IMA status: approved, named in 2019.
It is found associated with Distribution From the Poudrette Quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu, Montérégie, Québec, Canada.
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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