Willyamite

Formula: (Co,Ni)SbS

Origin of name: for locality, A.B.H. Consols mine, Broken Hill, Willyama Township, New South Wales, Australia.

 

Crystal system: triclinic or monoclinic, pseudocubic

Crystal class: unknown

Twinning:

Unit cell: a = 5.86

 

Colour: Steel-gray to silver-white

Diaphaneity: Opaque

Luster: Metallic

Habit: crystals cubic or pseudocubic, to several mm

Hardness: 5.5

Specific gravity: 6.76

Cleavage: 1; {001} perfect

Tenacity: Brittle, uneven fracture

Streak: Grayish black

 

Synonyms/varieties:

 

Comments: Series with ullmanite

 

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