| Reference Type | Journal (article/letter/editorial) |
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| Title | Genetic model for the color anomalies at the termination of pegmatitic gem tourmaline crystals from the island of Elba, Italy |
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| Journal | European Journal of Mineralogy |
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| Authors | Altieri, Alessandra | Author |
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| Pezzotta, Federico | Author |
| Andreozzi, Giovanni B. | Author |
| Skogby, Henrik | Author |
| Bosi, Ferdinando | Author |
| Year | 2023 (September 15) | Volume | 35 |
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| Page(s) | 755-771 | Issue | 5 |
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| Publisher | Copernicus GmbH |
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| URL | |
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| Download URL | https://ejm.copernicus.org/articles/35/755/2023/ejm-35-755-2023.pdf+ |
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| DOI | doi:10.5194/ejm-35-755-2023Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 16773159 | Long-form Identifier | mindat:1:5:16773159:9 |
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| GUID | e44deb0d-b3c7-40c0-ad2f-4fadfd952958 |
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| Full Reference | Altieri, Alessandra, Pezzotta, Federico, Andreozzi, Giovanni B., Skogby, Henrik, Bosi, Ferdinando (2023) Genetic model for the color anomalies at the termination of pegmatitic gem tourmaline crystals from the island of Elba, Italy. European Journal of Mineralogy, 35 (5) 755-771 doi:10.5194/ejm-35-755-2023 |
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| Plain Text | Altieri, Alessandra, Pezzotta, Federico, Andreozzi, Giovanni B., Skogby, Henrik, Bosi, Ferdinando (2023) Genetic model for the color anomalies at the termination of pegmatitic gem tourmaline crystals from the island of Elba, Italy. European Journal of Mineralogy, 35 (5) 755-771 doi:10.5194/ejm-35-755-2023 |
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| In | (2023) European Journal of Mineralogy Vol. 35 (5) Schweizerbart |
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| Abstract/Notes | Tourmaline crystals from the island of Elba commonly display a sharp transition to dark colors at the analogous termination due to the incorporation of Fe and/or Mn during the latest stages of crystallization in pegmatites. The formation of such color anomalies is related to a dramatic physicochemical change in the crystallization environment as a consequence of an opening of the geochemical system. However, mechanisms that may lead to the availability of Fe and/or Mn in the residual cavity fluids have been unclear. On the basis of chemical and spectroscopic investigations, combined with structural and paragenetic observations of the cavities, we propose a general genetic model in which, as a consequence of a pocket rupture event, chemical alteration of Fe- and Mn-rich minerals that formed early in the pegmatitic rock surrounding the cavities occurred through leaching processes, produced by the action of the highly reactive late-stage cavity fluids. Such processes were responsible for the release of Fe and Mn in the geochemical system, allowing the formation of the late-stage dark-colored terminations in the tourmaline crystals. In some cavities, a high availability of Mn and/or Fe determined the evolution of the crystals from an initial elbaite/fluor-elbaite composition to celleriite, foitite or schorl. This compositional evolution trend can be described by the following general chemical substitution: XNa+ + Y(Li1.5 + Al0.5)3+ + WF− ↔ X□ + 2Y(Fe,Mn)2+ + WOH−. |
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