Iranite

General
Category| Silicate mineral
Formula
(repeating unit)| Pb10Cu(CrO4)6(SiO4)2(F,OH)2
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
|re|er}}| 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| [1][2][3]

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).[2]

It occurs as an oxidation product of hydrothermal lead-bearing veins. Associated minerals include dioptase, fornacite, wulfenite, mimetite, cerussite and diaboleite.[1] It was first described in 1970 for an occurrence in the Sebarz Mine, northeast of Anarak, Iran.[2][1]

## References

1. ↑ 1.0 1.1 1.2 Handbook of Mineralogy
2. ↑ 2.0 2.1 2.2 Mindat page for Iranite
3. ↑ Webmineral data for Iranite
4. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.

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