Hiärneite

Hiärneite is an oxide mineral named after the Swedish geologist Urban Hiärne (1641-1727).[3] 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.[4] The mineral was described in 1997 for its occurrence in a skarn environment in Långban iron–manganese deposit of the Filipstad district, Värmland, Sweden.[5][2]

Hiärneite
General
CategoryOxide mineral
Formula
(repeating unit)
(Ca,Mn,Na)2(Zr,Mn3+)5(Sb,Ti,Fe)2O16
Strunz classification4.DL.10
Crystal systemTetragonal
Crystal classDitetragonal dipyramidal (4/mmm)
H-M symbol: (4/m 2/m 2/m)
Space groupI41/acd
Unit cella = 15.264 Å,
c = 10.089 Å; Z = 8
Identification
ColorRed
Crystal habitPrismatic, subhedral
CleavageNone
Mohs scale hardness7
DiaphaneityTranslucent
Specific gravity5.44
Optical propertiesUniaxial (+)
Refractive indexnω = 2.120 nε = 2.160
Birefringenceδ = 0.040
References[1][2]

Sources


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