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 | |
| 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] |
Sources
- Hiärneite on Mindat.org
- Hiärneite data on Webmineral
- Nationalencyklopedin online
- from Naturhistoriska riksmuseet (translation from Swedish ~: Swedish Museum of Natural History) Archived 2013-12-02 at the Wayback Machine
- 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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