Brigatti, M. F., Caprilli, E., Malferrari, D., Mottana, A. (2007) Crystal structure and crystal chemistry of fluorannite and its relationships to annite. Mineralogical Magazine, 71 (6) 683-690 doi:10.1180/minmag.2007.071.6.683
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Crystal structure and crystal chemistry of fluorannite and its relationships to annite | ||
| Journal | Mineralogical Magazine | ||
| Authors | Brigatti, M. F. | Author | |
| Caprilli, E. | Author | ||
| Malferrari, D. | Author | ||
| Mottana, A. | Author | ||
| Year | 2007 (December) | Volume | 71 |
| Issue | 6 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2007.071.6.683Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243787 | Long-form Identifier | mindat:1:5:243787:7 |
| GUID | 0 | ||
| Full Reference | Brigatti, M. F., Caprilli, E., Malferrari, D., Mottana, A. (2007) Crystal structure and crystal chemistry of fluorannite and its relationships to annite. Mineralogical Magazine, 71 (6) 683-690 doi:10.1180/minmag.2007.071.6.683 | ||
| Plain Text | Brigatti, M. F., Caprilli, E., Malferrari, D., Mottana, A. (2007) Crystal structure and crystal chemistry of fluorannite and its relationships to annite. Mineralogical Magazine, 71 (6) 683-690 doi:10.1180/minmag.2007.071.6.683 | ||
| Abstract/Notes | Abstract This study focuses on the crystal-chemical characterization of fluorannite from the Katugin Ta-Nb deposit, Chitinskaya Oblast’, Kalar Range, Transbaikalia, eastern Siberia, Russia. The chemical formula of this mineral is (K0.960Na0.020Ba0.001)(Fe2+ 2.102Fe3+ 0.425Cr3+ 0.002Mg0.039Li0.085Ti0.210Mn0.057)(Al0.674Si3.326) O10(F1.060OH0.028O0.912). This mica belongs to the 1M polytype (space group C2/m) with layer parameters a = 5.3454(2) Å, b = 9.2607(4) Å, c = 10.2040(5) Å, b = 100.169(3)º. Structure refinement, using anisotropic displacement parameters, converged at R = 0.0384. When compared to annite, fluorannite shows a smaller cell volume (Vfluorannite = 497.19 Å3; Vannite = 505.71 Å3), because of its smaller lateral dimensions and c parameter. Flattening in the plane of the tetrahedral basal oxygen atoms decreases with F content, together with the A–O4 distance (i.e. the distance between interlayer cation A and the octahedral anionic position) due to the reduced repulsion between the interlayer cation and the anion sited in O4. | ||
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