Iranite
(repeating unit)Pb10Cu(CrO4)6(SiO4)2(F,OH)2 IMA symbol Irn[1] Strunz classification 7.FC.15 Crystal system Triclinic Space group Triclinic pedial
H-M symbol: (1)
Space group: P1 Unit cell a = 10.02 Å, b = 9.54 Å, c = 9.89 Å; α = 104.5°, β = 66°, γ = 108.5°; Z = 1 Identification Color Brown to orange Crystal habit Equant to flattened euhedral crystals Mohs scale hardness 3 Luster Vitreous Streak Yellow Specific gravity 5.8 Optical properties Biaxial Refractive index nα = 2.250 – 2.300 nγ = 2.400 – 2.500 Birefringence δ = 0.150 – 0.200 References [2][3][4]
H-M symbol: (1)
Space group: P1
Iranite (Persian: ایرانیت) is a triclinic lead copper chromate silicate mineral with formula Pb10Cu(CrO4)6(SiO4)2(F,OH)2. It was first described from an occurrence in Iran. It is the copper analogue of hemihedrite (Pb10Zn(CrO4)6(SiO4)2(F,OH)2).[3]
It occurs as an oxidation product of hydrothermal lead-bearing veins. Associated minerals include dioptase, fornacite, wulfenite, mimetite, cerussite and diaboleite.[2] It was first described in 1970 for an occurrence in the Sebarz Mine, northeast of Anarak, Iran.[3][2]
References
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