Meneghinite

Formula:  Pb₁₃CuSb₇S₂₄

Origin of name:  For G. Meneghini, Italian mineralogist

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning: 

Unit cell: a = 11.43 Å, b = 24.03 Å, c = 99.09 Å

Colour:  Blackish lead-gray

Diaphaneity:  Opaque

Luster:  Bright metallic

Habit:  Crystals slender prismatic, striated along elongation; massive, fibrous to compact

Hardness:  2.5

Specific gravity:  6.36

Cleavage:  2; {010} perfect, interrupted; {001} difficult

Tenacity: 

Streak:  Black, shining

Synonyms/varieties:

Comments: