Eugenite

Formula:   Ag₁₁Hg₂

Origin of name:   For Eugen F. Stumpfl, Austrian geologist

Crystal system:   Cubic

Crystal class:   -43m

Twinning:

Unit cell: 

Colour:  White with yellow tinge

Diaphaneity:  Opaque

Luster:

Habit:   Grains to 4 mm

Hardness:   2.5

Specific gravity:   10.75

Cleavage:   None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:   Known from polished section only