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Portugal | |
| Chiappino, L., Astolfi, M., Bracco, R., Marchesini, M. & Selmi, P. (2015): I minerali del Vulcano di Fogo (Agua de Pau), São Miguel, Azzorre, Portogallo. Rivista Mineralogica Italiana 39(4), 220-250 (in Italian). Samples collected by Luigi Chiappino and analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA |
| Pedro Alves collection and analytical data |
Água de Pau Volcano, São Miguel, Azores, Portugal