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Leggia Valley, Leggia, Grono, Moesa, Mesolcina Valley (Misox), Grischun (Grisons; Graubünden), Switzerland

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 46° North , 9° East (est.)
Margin of Error:~1km
Other regions containing this locality:The Alps, Europe
Köppen climate type:Dfc : Subarctic climate
Name(s) in local language(s):Val Leggia, Leggia, Grono, Moesa (Moesano), Val Mesolcina (Valle Mesolcina; Misox), Graubünden (Grisons; Grischun; Grigioni), Schweiz (Suisse; Svizzera)


LCT and NYF pegmatites that are part of the so-called Bodengo pegmatite area, a large region including the upper portions of a series of valleys (Leggia and Cama valleys, Moesa, Graubünden, Switzerland; Bodengo, Soè and Garzelli valleys, Sondrio Province, Lombardy, Italy; Dosso and Darengo valleys, Como Province, Lombardy, Italy) located between the Mesolcina (west) and Mera (east) valleys, Southern Steep Belt of the Central Alps.

The two main LCT pegmatite bodies in Leggia Valley are known as Pizzo Paglia pegmatite dyke (2385 m a.s.l.; VLGa in Guastoni et al., 2014) and Colonello pegmatite dyke (2160 m a.s.l.; VLGb in Guastoni et al., 2014). They are characterised respectively by the following mineral assemblage: K feldspar, albite, quartz, muscovite, biotite, beryl, schorl, almandine-spessartine garnets (core Alm58Sps41Pyr1 to rim Alm73Sps23Pyr3 ), zircon; K feldspar, albite, albite var. cleavelandite, quartz, muscovite, beryl, schorl, almandine-spessartine garnets, wodginite, zircon.

A NYF pegmatite body outcrops at an intermadiate elevation between the previous ones (VLGm in Guastoni et al., 2014). It is characterised by the presence of K feldspar, albite, quartz, aeschynite-(Y), biotite, columbite-(Fe), euxenite-(Y), monazite-(Ce), spessartine-almandine garnets (core Sps65Alm29Pyr4 to rim Sps51Alm40Py5), zircon.


Mineral List

Mineral list contains entries from the region specified including sub-localities

13 valid minerals.

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Switzerland

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References

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Guastoni, A. (2012) LCT (lithium, cesium, tantalum) and NYF (niobium, yttrium, fluorine) pegmatites in the Central Alps. Proxies of exhumation history of the Alpine nappe stack in the Lepontine Dome. Ph.D. Thesis. University of Padova, Dept. of Geosciences, 159 pp.
Guastoni, A., Pennacchioni, G., Pozzi, G., Fioretti, A. M., Walters, J.M. (2014) Tertiary pegmatite dikes of the Central Alps. The Canadian Mineralogist, 52, 2, 191-219.
Guastoni, A., Pozzi, G., Secco, L., Schiazza, M., Pennacchioni, G., Fioretti, A. M., Nestola, F. (2016) Monazite-(Ce) and xenotime-(Y) from an LCT, NYF Tertiary pegmatite field: Evidence from a regional study in the Central Alps (Italy and Switzerland). The Canadian Mineralogist, 54, 4, 863-877.

 
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