Geographic Minerals



Hiärneite is an oxide mineral named after the Swedish geologist Urban Hiärne (1641-1727). It is an oxide mineral containing antimony and zirconium. The mineral can be found in rocks that mainly consists of fine-grained phlogopite. Hiärneite is the first known mineral that contains both of the chemical elements antimony and zirconium.

The mineral was described in 1997 for its occurrence in a skarn environment in Långban iron–manganese deposit of the Filipstad district, Värmland, Sweden.

General Information

  • Category: Oxide mineral
  • Formula: (Ca,Mn,Na)2(Zr,Mn3+)5(Sb,Ti,Fe)2O16
  • Crystal system: Tetragonal
  • Crystal class: Ditetragonal dipyramidal (4/mmm)

Fig: Hiärneite


  • Color: Red
  • Crystal habit: Prismatic, subhedral
  • Cleavage: None
  • Mohs scale hardness: 7
  • Diaphaneity: Translucent
  • Specific gravity: 5.44
  • Optical properties: Uniaxial (+)


Hiärneite is a new Sb-bearing mineral isostructural with calzirtite. It occurs in a skarn mineral assemblage, coexisting with phlogopite, calcite, arsenatian fluorapatite, svabite, jacobsite, magnetoplumbite, titanian bindheimite, and pyrophanite, from the Långban deposit, Filipstad, Sweden.


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