Menchettiite
Menchettiite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₅Mn₃Ag₂Sb₆As₄S₂₄.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Lillianite structural group.
Key properties: Mohs hardness 2.5–3; specific gravity 5.146; Black streak; Metallic luster.
IMA symbol Men, IMA status: approved, named in 2011.
Found in a polymetallic (Ag-Mn-Pb-Zn) vein, replacement, and contact metamorphic mineral district.
It is found associated with Orpiment, tennantite/tetrahedrite, quartz, calcite.
The mineral was named to honor Silvio Menchetti (b. 1937), Professor of Mineralogy and Crystallography, University of Florence, Italy.
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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