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Tourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California: A detailed investigation by A. Ertl; G. R. Rossman; J. M. Hughes; D. London; Y. Wang; J. A. O'Leary; M. D. Dyar; S. Prowatke; T. Ludwig; E. Tillmanns is a Earth and Planetary Sciences article available to read on EtoBox.
What is Tourmaline of the elbaite-schorl series from the Himalaya Mine, Mesa Grande, California: A detailed investigation about?
Chemical, structural, infrared, optical, and Mössbauer spectroscopic data were obtained on tourmalines from gem pockets in the Himalaya mine, San Diego County, California, including a strongly color-zoned crystal. Calcium and Li abundances increase from core to rim, whereas Mn 2+ and F increase, reach a maximum, and then decrease. Upon initiation of crystallization of lepidolite, F contents in tourmaline decrease. The black core is a Mn-bearing "oxy-schorl." The grayish-yellow, intermediate zone is Mn-rich "fluor-elbaite" that contains a relatively high Mn content with ~6 wt% MnO. The nearly colorless "fluor-elbaite" rim has the highest Li content of all zones. There is an inverse correlation between the lattice parameter a (for values ≥15.84 Å) and the Li content (r 2 = 0.96). Mössbauer studies from the different zones within this crystal show that the Fe 3+ /Fe(total) ratio increases continuously from the Fe-rich core to the Fe-poor near-rim zone, consistent with increasing oxygen fugacity during pegmatite pocket evolution. There is a high positive correlation between lattice parameter a (for values ≥15.84 Å) and (Fe 2+ +Mn 2+ ) content in tourmalines from the elbaite-schorl seri
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It is typically read by researchers, students, and practitioners in Earth and Planetary Sciences.
- Author
- A. Ertl; G. R. Rossman; J. M. Hughes; D. London; Y. Wang; J. A. O'Leary; M. D. Dyar; S. Prowatke; T. Ludwig; E. Tillmanns
- Publisher
- Mineralogical Society of America
- Published
- 2009
- Language
- EN
- Field
- Earth and Planetary Sciences (Physical Sciences)