Marumoite
Marumoite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Pb₃₂As₄₀S₉₂.
It crystallizes in the monoclinic crystal system (space group P2_1).
Key properties: Metallic luster.
IMA symbol Mrm, IMA status: approved, named in 1998.
Found in a high-sulfidation, epithermal, Cu-Pb-Zn disseminated, massive sulfide deposit (Japan).
The mineral was named to honor Fumiyuki Marumo (b. 1931), professor of mineralogy and crystallography at Nihon University, Tokyo, Japan, a specialist on the structures of sulfosalt minerals.
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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