Murchisite
Murchisite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Cr₅S₆.
It crystallizes in the hexagonal crystal system (space group P-31c).
Key properties: specific gravity 4.22.
IMA symbol Mur, IMA status: approved, named in 2010.
A low-temperature phase (~327 flC in the Cr-S system), probably formed from higher temperature Cr1-xS exsolved or expelled from a Cr-S-bearing.
It is found associated with Low-Ni iron (“kamacite”), martensitic iron, schreibersite, Ca-Al-rich glass, forsteritic olivine (crystal 1); tochilinite, serpentine, chromite.
The name refers to the Murchison meteorite.
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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