Hålenius, Ulf, Bosi, Ferdinando (2015) Gatedalite, Zr(Mn2+2Mn3+4)SiO12, a new mineral species of the braunite group from Långban, Sweden. Mineralogical Magazine, 79 (3). 625-634 doi:10.1180/minmag.2015.079.3.08
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Gatedalite, Zr(Mn2+2Mn3+4)SiO12, a new mineral species of the braunite group from Långban, Sweden | ||
| Journal | Mineralogical Magazine | ||
| Authors | Hålenius, Ulf | Author | |
| Bosi, Ferdinando | Author | ||
| Year | 2015 (June) | Volume | 79 |
| Page(s) | 625-634 | Issue | 3 |
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2015.079.3.08Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 244657 | Long-form Identifier | mindat:1:5:244657:2 |
| GUID | 0 | ||
| Full Reference | Hålenius, Ulf, Bosi, Ferdinando (2015) Gatedalite, Zr(Mn2+2Mn3+4)SiO12, a new mineral species of the braunite group from Långban, Sweden. Mineralogical Magazine, 79 (3). 625-634 doi:10.1180/minmag.2015.079.3.08 | ||
| Plain Text | Hålenius, Ulf, Bosi, Ferdinando (2015) Gatedalite, Zr(Mn2+2Mn3+4)SiO12, a new mineral species of the braunite group from Långban, Sweden. Mineralogical Magazine, 79 (3). 625-634 doi:10.1180/minmag.2015.079.3.08 | ||
| Abstract/Notes | Abstract Gatedalite, Zr(Mn22+Mn43+)SiO12, is a new mineral of the braunite group. It is found in hausmannite-impregnated skarn together with jacobsite, Mn-bearing calcite, tephroite, Mn-bearing phlogopite, långbanite, pinakiolite and oxyplumboroméite at the Långban Mn-Fe oxide deposit, Värmland, central Sweden. The mineral occurs as very rare, small (≤60 μm), grey, submetallic, irregularly rounded anhedral grains. Gatedalite has a calculated density of 4.783 g/cm3. It is opaque and weakly anisotropic with reflectivity in air varying between 17.1 and 20.8% in the visible spectral range. Gatedalite is tetragonal, space group I41/acd, with the unit-cell parameters a = 9.4668(6) Å, c = 18.8701(14) Å, V = 1691.1(2) Å3 and Z = 8. The crystal structure was refined to an R1 index of 5.09% using 1339 unique reflections collected with MoKαX-ray radiation. The five strongest powder X-ray diffraction lines [d in Å, (I), (hkl)] are: 2.730(100)(224), 2.367(12)(040), 1.6735(12)(440), 1.6707(29)(048) and 1.4267(16)(264). Electron microprobe analyses in combination with single-crystal structure refinement resulted in the empirical formula: (Zr0.494+Mn0.402+Mg0.07Ca0.02Zn0.01Ce0.013+)Σ1.00(Mn4.443+Fe0.593+Mn0.572+Mg0.41Al0.01)Σ6.02Si0.99O12. Gatedalite is a member of the braunite group (general formula AB6SiO12). It is related to braunite (Mn2+Mn63+SiO12) through the net cation exchange (Zr4+ + Mn2+) → 2Mn3+, which results from the substitutions Zr4+ → Mn2+ at the 8-fold coordinated site (A in the general formula) coupled with a 2Mn2+ → 2Mn3+ substitution at the 6-fold coordinated sites (B in the general formula). | ||
Map of Localities
Mineral Occurrences
| Locality | Mineral(s) |
|---|---|
| Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden | ⓘ Gatedalite |
See Also
These are possibly similar items as determined by title/reference text matching only.
