Ciriottiite
Ciriottiite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Cu₄Pb₁₉(Sb,As,Bi)₂₂(As₂)S₅₆.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Madocite structural group.
Key properties: Mohs hardness 3–3.5; specific gravity 5.918; Black streak; Metallic luster.
IMA symbol Cit, IMA status: approved, named in 2015.
Found in a vug in a quartz vein in a complex hydrothermal sulfide deposit.
It is found associated with Arsenopyrite, a kobellite-like mineral.
The mineral was named to honor Marco Ernesto Ciriotti (b. 1945), Italian member of the IMA CNMNC since 2013, and president of the Italian Micromineralogical Association.
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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