Iranite

Formula:  Pb₁₀Cu(CrO₄)₆(SiO₄)₂(F,OH)₂

Origin of name:  From locality; Iran

Crystal system:  Triclinic

Crystal class:  1 or -1

Twinning:  Common on {12-1}

Unit cell: a = 10.02 Ǻ, b = 9.54 Ǻ, c = 9.89 Ǻ, α = 104.5°, β = 66°, γ = 108.5°

Colour:  Yellow

Diaphaneity: 

Luster:  Vitreous

Habit:  Crystals microscopic

Hardness: 

Specific gravity:  5.8

Cleavage:  None

Tenacity: 

Streak:  Saffron yellow

Synonyms/varieties:  Khuniite

Comments:  Series with hemihedrite