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
- ↑ Hiärneite on Mindat.org
- 1 2 Hiärneite data on Webmineral
- ↑ Nationalencyklopedin online
- ↑ from Naturhistoriska riksmuseet (translation from Swedish ~: Swedish Museum of Natural History)
- ↑ Martin, R. F. and W. H. Blackburn, Encyclopedia of Mineral Names: First Update, The Canadian Mineralogist, 1999. Vol.37, p 1154
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