Fizelyite

Formula:  Pb₁₄Ag₅Sb₂₁S₄₈

Origin of name:   For S. Fizély, Romanian mining engineer

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: 

Colour:  Dark lead-gray

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Crystals prismatic, deeply striated

Hardness:  2

Specific gravity:  5.56

Cleavage:  1; {010}

Tenacity: 

Streak: 

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