Tischendorfite

Formula: Pb₈Hg₃Se₉

Origin of name: For Gerhard Tischendorf (1927-) who first recognized the mineral in the deposit in 1958.

Crystal system: Orthorhombic

Crystal class: mmm or mm2

Twinning: 

Unit cell: a = 7.219, b = 16.782, c = 6.467

Colour: Silver-gray, beige

Diaphaneity: Opaque

Luster: Metallic

Habit: Anhedral grains, inclusions

Hardness: 4.5-5

Specific gravity: 

Cleavage: 

Tenacity: Brittle, uneven fracture

Streak: Black

Synonyms/varieties:

Comments:  Found as included mineral found in other selenides in an ankerite-calcite matrix.