Semseyite

Formula: Pb9Sb8S21

Origin of name: for A. von Semsey, Hungarian nobelman

 

Crystal system: monoclinic

Crystal class: 2/m

Twinning:

Unit cell: 

 

Colour: lead-gray to black

Diaphaneity: opaque

Luster: metallic, tarnishes dull

Habit: crystals tabular or prismatic, may be twisted, aggregates and subparallel groups

Hardness: 2.5

Specific gravity: 6.08

Cleavage: 1; {112} perfect

Tenacity: 

Streak: black

 

Synonyms/varieties:

 

Comments: 

 

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