Murunskite

Formula:  K2Cu3FeS4

Origin of name:  After locality, Murun alkaline complex, Yakutiya, Russia

 

Crystal system:  Tetragonal

Crystal class:  -42m

Twinning: 

Unit cell: 

 

Colour:  Blue-gray

Diaphaneity: 

Luster:  Metallic

Habit:  Grains < 1μm, in aggregates to 0.2 mm

Hardness:  3

Specific gravity:  3.81

Cleavage:  None

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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