Brunogeierite

Formula: (Ge,Fe)Fe2O4

Origin of name:  For Bruno Geier, Namibian mineralogist

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:   Gray, black

Diaphaneity:  Opaque

Luster:

Habit:  Massive, thin rims on tennantite

Hardness:  > 4.5

Specific gravity:   5.51

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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