Guastoni, A., Nestola, F., Mazzoleni, G., Vignola, P. (2007) Mn-rich graftonite, ferrisicklerite, staněkite and Mn-rich vivianite in a granitic pegmatite at Soè Valley, central Alps, Italy. Mineralogical Magazine, 71 (5) 579-585 doi:10.1180/minmag.2007.071.5.579
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Mn-rich graftonite, ferrisicklerite, staněkite and Mn-rich vivianite in a granitic pegmatite at Soè Valley, central Alps, Italy | ||
| Journal | Mineralogical Magazine | ||
| Authors | Guastoni, A. | Author | |
| Nestola, F. | Author | ||
| Mazzoleni, G. | Author | ||
| Vignola, P. | Author | ||
| Year | 2007 (October) | Volume | 71 |
| Issue | 5 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2007.071.5.579Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243778 | Long-form Identifier | mindat:1:5:243778:5 |
| GUID | 0 | ||
| Full Reference | Guastoni, A., Nestola, F., Mazzoleni, G., Vignola, P. (2007) Mn-rich graftonite, ferrisicklerite, staněkite and Mn-rich vivianite in a granitic pegmatite at Soè Valley, central Alps, Italy. Mineralogical Magazine, 71 (5) 579-585 doi:10.1180/minmag.2007.071.5.579 | ||
| Plain Text | Guastoni, A., Nestola, F., Mazzoleni, G., Vignola, P. (2007) Mn-rich graftonite, ferrisicklerite, staněkite and Mn-rich vivianite in a granitic pegmatite at Soè Valley, central Alps, Italy. Mineralogical Magazine, 71 (5) 579-585 doi:10.1180/minmag.2007.071.5.579 | ||
| Abstract/Notes | AbstractMn-rich graftonite, (Ca,Mn2+)(Fe2+,Mn2+)2(PO4)2, ferrisicklerite, Li1–x(Fe3+,Mn2+)PO4, manganoan apatite, (Ca,Mn2+,Fe2+Mg)(PO4)3Cl, staně kite, Fe3+Mn2+O(PO4) and Mn-rich vivianite, (Fe2+)3(PO4)2·8H2O, occurring in a granitic pegmatite at Soè Valley (central Alps, Italy) were characterized by powder and single-crystal X-ray diffraction (XRD) and electron microprobe analyses. Geochemically, the Mn-rich graftonite phases are poorly evolved Fe/Mn-phosphates of rare-earth elements-lithium (REE-Li) granitic pegmatites. The assemblage Mn-rich graftonite + ferrisicklerite + staněkite has rarely beendocumen ted in pegmatites. Inthe Soè Valley pegmatite, ferrisicklerite forms exsolution lamellae with Mn-rich graftonite associated with manganoan apatite and staněkite. Graftonite is associated with Mn-rich vivianite. Powder and single-crystal XRD data indicate that the unit-cell volume of graftonite increases as a function of Mn2+ content. Staněkite shows a distinctly smaller unit-cell volume with respect to previously reported staněkites, probably due to reduced Mn2+. Vivianite with significant Mn2+ has a unit-cell volume similar to nearly Mn-free vivianite. The formation of Mn-rich graftonite and manganoan apatite is related to destabilization of Mn-rich almandine and biotite during pegmatite formation. Ferrisicklerite forms exsolution lamellae along the 010 cleavage planes of Mn-rich graftonite, whereas staněkite forms by alterationof ferrisicklerite and Mn-rich vivianite due to circulation of late-stage hydrothermal fluids. | ||
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