Zoubekite

Formula: AgPb₄Sb₄S₁₀

Origin of name: for Vladimir Zoubeck (1903-), Czech geologist

Crystal system: Orthorhombic

Crystal class: Unknown

Twinning:

Unit cell: a = 18.698 Å, b = 6.492 Å, c = 4.577 Å

Colour: Steel-gray

Diaphaneity: Opaque

Luster: Metallic

Habit: Lath-shaped crystals, irregular, to 0.5 mm, microscopic crystlas

Hardness: 3.5 - 4

Specific gravity: 5.15

Cleavage: None

Tenacity: Uneven fracture

Streak: Black

Synonyms/varieties:

Comments: