Murunskite
Murunskite is an IMA-recognized mineral species in the sulfide class, with the chemical formula K₂(Cu,Fe)₄S₄.
It crystallizes in the tetragonal crystal system (space group I4/mmm). It is a member of the Bukovite structural group.
Key properties: specific gravity 3.86; Metallic. Anisotropism: Moderate, gray to brownish gray with a bluish tint. R: (400) —, (420) —, (440) 15.0 luster.
IMA symbol Mu, IMA status: approved, named in 1980.
Found in rocks that have undergone intensive potassium metasomatism.
It is found associated with Charoite, acmite, potassium feldspar.
The name is derived from the locality in the Murun massif, Russia.
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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