Sugakiite
Sugakiite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cu(Fe,Ni)₈S₈.
It crystallizes in the tetragonal crystal system (space group P4_2/mnm). It is a member of the Pentlandite structural group.
Key properties: specific gravity 4.71; Metallic. Tarnishes brownish gray on exposure to air luster.
IMA symbol Sgk, IMA status: approved, named in 2005.
An intergranular exsolved phase in sulfide aggregates in lherzolite in a peridotite massif.
It is found associated with Bornite, talnakhite, copper, (Fe, Ni, Co, Cu)9S8, Cu2(Fe, Ni)7S8.
The mineral was named to honor emeritus professor Asahiko Sugaki (b 1923), Tohoku University, Sendai, Japan, for his studies on sulfide phase equilibria.
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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