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Formula: K2(Cu,Fe)4S4
Sulphide, bukovite group
Crystal System: Tetragonal
Specific gravity: 3.86 calculated
Hardness: 3
Colour: Copper-red to copper-brown, with characteristic iridescence
Environments
Plutonic igneous environments
Metamorphic environments
Murunskite oxidises quickly in air and becomes covered with a black, sooty film.
Localities
At the type locality, the Murunskii Massif, Chara and Tokko Rivers Confluence, Aldan Shield, Russia,
murunskite occurs as small grains, less than 1 micron, or as aggregates up to 0.2 mm in rocks that have
undergone intensive potassium metasomatism. Associated minerals include
charoite, aegirine and
K-feldspar
(AM 67.624).
At the Koashva Mt, Khibiny Massif, Murmansk Oblast, Russia, murunskite occurs in a
microcline – pectolite –
sodalite – aegirine vein within
feldspathic urtite. Clusters
up to 4 mm in diameter of elongate crystals of murunskite and well-formed cubic crystals of
loparite-(Ce) occur at borders between
villiaumite and microcline,
sodalite and lomonosovite
(CM 41.503-511).
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