Djerfisherite

Formula:  K₆(Cu,Fe,Ni)₂₅S₂₆Cl

Origin of name:   For Daniel Jerome Fisher (1896-1988), American mineralogist

Crystal system:   Cubic

Crystal class:   4/m -3 2/m

Twinning:

Unit cell: a =  10.465 Å

Colour:   Greenish brown to greenish yellow, close to khaki, to olive-drab

Diaphaneity: Opaque

Luster:   Submetallic

Habit:   Tiny grains

Hardness:   < 3.5

Specific gravity:  

Cleavage:   None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: Found in hydrothermal  Cu-Ni ores, in skarns, pegmatites, kimberlites and in mafic alkalic diatremes.