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Cu- and Mn-bearing tourmalines from Brazil and Mozambique: crystal structures, chemistry and correlations
Please always quote using this URN: urn:nbn:de:bvb:20-opus-127296
- Cu- and Mn-bearing tourmalines from Brazil and Mozambique were characterised chemically (EMPA and LA-ICP-MS) and by X-ray single-crystal structure refinement. All these samples are rich in Al, Li and F (fluor-elbaite) and contain significant amounts of CuO (up to ~1.8 wt%) and MnO (up to ~3.5 wt%). Structurally investigated samples show a pronounced positive correlation between the <Y-O> distances and the (Li + Mn\(^{2+}\) + Cu + Fe\(^{2+}\)) content (apfu) at this site with R\(^2\) = 0.90. An excellent negative correlation exists between theCu- and Mn-bearing tourmalines from Brazil and Mozambique were characterised chemically (EMPA and LA-ICP-MS) and by X-ray single-crystal structure refinement. All these samples are rich in Al, Li and F (fluor-elbaite) and contain significant amounts of CuO (up to ~1.8 wt%) and MnO (up to ~3.5 wt%). Structurally investigated samples show a pronounced positive correlation between the <Y-O> distances and the (Li + Mn\(^{2+}\) + Cu + Fe\(^{2+}\)) content (apfu) at this site with R\(^2\) = 0.90. An excellent negative correlation exists between the <Y-O> distances and the Al\(_2\)O\(_3\) content (R\(^2\) = 0.94). The samples at each locality generally show a strong negative correlation between the X-site vacancies and the (MnO + FeO) content. The Mn content in these tourmalines depends on the availability of Mn, on the formation temperature, as well as on stereochemical constraints. Because of a very weak correlation between MnO and CuO we believe that the Cu content in tourmaline is essentially dependent on the availability of Cu and on stereochemical constraints.…
Author: | Andreas Ertl, Gerald Giester, Ulrich Schüssler, Helene Brätz, Martin Okrusch, Ekkehart Tillmanns, Hermann Bank |
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URN: | urn:nbn:de:bvb:20-opus-127296 |
Document Type: | Journal article |
Faculties: | Philosophische Fakultät (Histor., philolog., Kultur- und geograph. Wissensch.) / Institut für Geographie und Geologie |
Language: | English |
Parent Title (English): | Mineralogy and Petrology |
Year of Completion: | 2013 |
Volume: | 107 |
Issue: | 2 |
Pagenumber: | 265-279 |
Source: | Mineralogy and Petrology (2013) 107:265–279 DOI 10.1007/s00710-012-0234-6 |
DOI: | https://doi.org/10.1007/s00710-012-0234-6 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 54 Chemie / 549 Mineralogie |
Tag: | Brazil; Mozambique; mineralogy |
Release Date: | 2016/09/07 |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung |