Medenbachite
Medenbachite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Bi₂Fe³⁺Cu²⁺(AsO₄)₂O(OH)₃.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Medenbachite structural group.
Key properties: Mohs hardness 4.5; specific gravity 5.9; Vitreous to adamantine luster; optically biaxial.
IMA symbol Mdb, IMA status: approved, named in 1993.
Found as a very rare secondary mineral in a weathered polymetallic sulfide vein.
It is found associated with Mixite, preisingerite, alunite, goethite, reichenbachite, malachite, quartz.
The mineral was named to honor Olaf Medenbach (1949–), mineralogist, Ruhr University, Bochum, Germany.
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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