Hiärneite

Hiärneite
General
Category Oxide mineral
Formula
(repeating unit)
(Ca,Mn,Na)2(Zr,Mn3+)5(Sb,Ti,Fe)2O16
Strunz classification 4.DL.10
Crystal system Tetragonal
Crystal class Ditetragonal dipyramidal (4/mmm)
H-M symbol: (4/m 2/m 2/m)
Space group I41/acd
Unit cell a = 15.264 Å,
c = 10.089 Å; Z = 8
Identification
Color Red
Crystal habit Prismatic, subhedral
Cleavage None
Mohs scale hardness 7
Diaphaneity Translucent
Specific gravity 5.44
Optical properties Uniaxial (+)
Refractive index nω = 2.120 nε = 2.160
Birefringence δ = 0.040
References [1][2]

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]

Sources


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