Latitude: 45°31'41"N
Longitude: 2°48'50"E
Porphyric trachyandesite (sancyite) dome, the highest summit of the French Massif Central (1885 m a.s.l.). This is the "type-locality" of "sancyite", a porphyric trachy-andesite with large sanidine crystals.
Note: Sulfur and alunite do not come from the Puy de Sancy proper, but from the neighbouring Ravin de la Craie (
http://www.mindat.org/loc-49192.html)Mineral List
3 entries listed. 2 valid minerals. 1 erroneous literature entry.
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