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Casnaggina Valley, Castasegna, Bregaglia Valley (Bergell), Grischun (Grisons; Graubünden), Switzerland

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Name(s) in local language(s): Val Casnaggina, Castasegna, Val Bregaglia (Bergell), Graubünden (Grisons; Grischun), Schweiz (Suisse; Svizzera)
 
Casnaggina brook (Torrente Casnaggina), which flows through the homonymous valley, forms the border between Italy and Switzerland.

Pegmatite dykes (containing spessartine, beryl, and schorl) crop out in in the area of Bocchetta della Teggiola (partly in Italian territory, see http://www.mindat.org/loc-56958.html). Here, chrysoberyl and bismuthinite have also been found.

Veins and scattered blocks of andalusite-bearing mica schist are found on the right side of the valley and at the foot of Denc dal Luf. The most known andalusite sites are: Casnac, Prä Salasc, Vöga, and Vec. Blocks of andalusite-bearing mica schist are found also along the riverbed. In all these sites andalusite is associated with minor sillimanite, cordierite, staurolite, and kyanite.

Cordierite has been described in a plagioclase-phlogopite schist outcropping at Lera d' Sura (Wenk et al., 1974).

Mineral List



13 entries listed. 12 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

- Wenk H.R., Wenk E., Wallace J.H. (1974): Metamorphic mineral assemblages in pelitic rocks of the Bergell Alps. Schweiz. Mineral. Petrogr. Mitt., 54, 507-554.
- Bedogné F., Montrasio A., Sciesa E. (1995): I minerali della provincia di Sondrio e della Bregaglia grigionese. Val Bregaglia, Val Masino, Val Codera e Valle Spluga. Bettini, Sondrio, 300 pp.

Mineral and/or Locality  
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