Iranite: Properties and Occurrences

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]. It was named after the type locality at Sebarz mine in the Esfahan province of Iran.

Iranite is a rare mineral that occurs only in localities in two other countries: Chile, and the United States. Iranite is found in oxidized lead-bearing hydrothermal deposits.

General Information

  • Category: Silicate mineral
  • Formula: [Pb10Zn(CrO4)6(SiO4)2(F,OH)2]
  • Crystal system: Triclinic
  • Space group: Triclinic pedial

Fig: Iranite

Properties

  • 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

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

Association: Dioptase, fornacite, wulfenite, mimetite, cerussite, diaboleite.

 

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