Plumbojarosite

Formula: PbFe₆(SO₄)₄(OH)₁₂

Origin of name: from Latin plumbum = lead and jarosite

Crystal system: hexagonal

Crystal class: -3 2/m

Twinning: 

Unit cell: 

Colour: yellowish brown to dark brown

Diaphaneity: 

Luster: dull to glistening or silky

Habit: microscopic hexagonal plates, as crusts or compact masses, ocherous

Hardness: 1

Specific gravity: 3.64

Cleavage: 1; {10-14} fair

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: Pb analogue of jarosite