Isomertieite

Formula:  Pb₁₁Sb₂As₂

Origin of name:  From isometric (cubic) crystal system and mertieite

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning: 

Unit cell: 

Colour:  Pale yellow-white in polished section

Diaphaneity: 

Luster: 

Habit:  Microscopic grains

Hardness:  5.5

Specific gravity:  10.33

Cleavage:  None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Dimorphous with mertieite