Kornite

Formula:  (Na,K)Na2Mg2Mn2Li5Si8O22(OH)2

Origin of name:  For Hermann Korn, German geologist

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

Unit cell: 

 

Colour:  Dark red to brownish lilac

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Bundles of fibers, bent, 5-10µm diameter <200 µm long

Hardness:  5 to 6

Specific gravity:  3.15

Cleavage:  1; Parallel to {001}

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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