(Lagoa do Fogo, Serra de Agua de Pau, Ilhas dos Açores, Portugal)
Peralkaline syenites ejecta within a Plinian fall deposit.
These syenites are derived from solidification zones around the margin of the parental trachyte magma chamber.
Refs.:
- Osann, A. (1888), Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130
- Cann, J.R. (1967): A second occurrence of dalyite..., Min. Mag. Vol.36, 227-232
- Booth, B., Croasdale, R., Walker, G.P.L. (1978): A quantitative study of five thousand years of volcanism on Sao Miguel, Azores, Philosophical transactions of the Royal Society of London, Vol. 288, No. 1352, 271-319
- Ternes, B. (1999): Mineralien von der Azoreninsel Sao Miguel (Portugal). Lapis, 24 (1), 20-42
- Ridolfi, F. et al. (2003): Evolutionary stages of crystallisation..., Min. Mag. 67(4), 749-767
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Map Reference: 37°46'N , 25°28'W
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Mineral list contains entries from the region specified including sub-localitiesMineral List:49 entries listed. 29 valid minerals.
Localities in this Region:
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- Agua de Pau volcano (Fogo volcano)
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