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Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal

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(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





 Map Reference: 37°46'N , 25°28'W

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


Mineral List:
  		•  Aegirine
    NaFe
    3+
     
    		[Si
     
    2
    		O
     
    6
    		]
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  Aegirine-augite
    (Na,Ca)(Fe
    3+
     
    		,Fe
    2+
     
    		,Mg,Al)Si
     
    2
    		O
     
    6
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  Aenigmatite
    Na
     
    2
    		Fe
    2+
    5
    		TiO
     
    2
    		(Si
     
    6
    		O
     
    18
    		)
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  Albite
    Na[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  'Amphibole Group'
    Reference: []
  		•  Annite
    KFe
    2+
    3
    		[(OH)
     
    2
    		|AlSi
     
    3
    		O
     
    10
    		]
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  'Apatite'
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  Arfvedsonite
    [Na][Na
     
    2
    		][Fe
    2+
    4
    		Fe
    3+
     
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Cann, J.R., A second accurence of dalyite and the petrology of some ejected syenite blocks from Sao Miguel, Azores, Mineralogical Magazine, 36, 227-232, 1967]
  		•  Astrophyllite
    (K,Na)
     
    3
    		(Fe,Mn)
     
    7
    		Ti
     
    2
    		Si
     
    8
    		O
     
    24
    		(O,OH)
     
    7
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888] [Ternes, B., Mineralien von der Azoreninsel Sao Miguel, Lapis, 20-42, 1999 ]
    Site Photo
    Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal
    © G.Fraccaro
  		•  Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    Reference: [Van King]
    Site Photo
    Agua de Pau Mt., Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal
    © Bruno Fonseca
  		•  Biotite
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  'Britholite Group'
    Reference: [Ridolfi, F. et al. (2003): Evolutionary stages of crystallisation..., Min. Mag. 67(4), 749-767]
  		•  Chevkinite-(Ce)
    (Ce,La,Ca,Th)
     
    4
    		(Fe
    2+
     
    		,Mg)(Fe
    2+
     
    		,Ti,Fe
    3+
     
    		)
     
    2
    		(Ti,Fe
    3+
     
    		)
     
    2
    		[O
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
     
    2
    Reference: [Mineralogical Magazine, August 2003, V. 67, N° 4, pp. 749-767.]
  		•  Dalyite
    K
     
    2
    		ZrSi
     
    6
    		O
     
    15
    Reference: [Cann, J.R.: A second occurrence of dalyite..., Min.Mag.36, 227-232; Mineralogical Magazine, August 2003, V. 67, N° 4, pp. 749-767.]
  		•  Diopside
    CaMg[Si
     
    2
    		O
     
    6
    		]
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  Eudialyte ?
    Na
     
    15
    		Ca
     
    6
    		(Fe
    2+
     
    		,Mn
    2+
     
    		)
     
    3
    		Zr
     
    3
    		[Si
     
    25
    		O
     
    73
    		](O,OH,H
     
    2
    		O)
     
    3
    		(OH,Cl)
     
    2
    Description: reported as an Eudialyte enriched in Niobium
    Reference: [Ridolfi, F. et al. (2003): Evolutionary stages of crystallisation..., Min. Mag. 67(4), 749-767]
  		•  Eudialyte Group
    Reference: [Ridolfi, F. et al. (2003): Evolutionary stages of crystallisation..., Min. Mag. 67(4), 749-767]
  		•  Euxenite-(Y)
    (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)
     
    2
    		O
     
    6
    Reference: [Ternes, B., Mineralien von der Azoreninsel Sao Miguel, Lapis, 20-42, 1999]
  		•  Fayalite
    Fe
    2+
    2
    		[SiO
     
    4
    		]
    Reference: [Cann, J.R., A second accurence of dalyite and the petrology of some ejected syenite blocks from Sao Miguel, Azores, Mineralogical Magazine, 36, 227-232, 1967]
  		•  Ferrokentbrooksite
    Na
     
    15
    		Ca
     
    6
    		(Fe,Mn)
     
    3
    		Zr
     
    3
    		NbSi
     
    25
    		O
     
    73
    		(O,OH,H
     
    2
    		O)
     
    3
    		Cl
     
    2
    Reference: [Ridolfi, F. et al. (2003): Evolutionary stages of crystallisation..., Min. Mag. 67(4), 749-767]
  		•  Ferrorichterite
    Na[CaNa][Fe
    2+
    5
    		][(OH)
     
    2
    		|Si
     
    8
    		O
     
    22
    		]
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  Fergusonite-(Y)
    YNbO
     
    4
    Reference: [Ternes, B., Mineralien von der Azoreninsel Sao Miguel, Lapis, 20-42, 1999]
  		•  Hedenbergite
    CaFe
    2+
     
    		[Si
     
    2
    		O
     
    6
    		]
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  Ilmenite
    Fe
    2+
     
    		TiO
     
    3
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  Katophorite
    Na[CaNa][Fe
    2+
    4
    		(Al,Fe
    3+
     
    		)][(OH)
     
    2
    		|AlSi
     
    7
    		O
     
    22
    		]
    Reference: [Ridolfi, F., Renzulli, A., Santi, P., Upton, B.G.J., Evolutionary stages of crystallisation of weakly peralkine syenites: evidence from ejecta in the plinian deposits of Agua de Pau volcano (Sao Miguel, Azores Islands), Mineralogical Magazine, 67(4), 749-767, 2003]
  		•  Låvenite
    (Na,Ca)
     
    2
    		(Mn
    2+
     
    		,Fe
    2+
     
    		)(Zr,Ti)[(O,OH,F)
     
    2
    		|Si
     
    2
    		O
     
    7
    		]
    Description:
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888],[ Mineralogical Magazine, August 2003, V. 67, N° 4, pp. 749-767]
  		•  Magnetite
    Fe
    2+
     
    		Fe
    3+
    2
    		O
     
    4
    Reference: [Ternes, B., Mineralien von der Azoreninsel Sao Miguel, Lapis, 20-42, 1999]
  		•  Pyrochlore
    (Ca,Na)
     
    2
    		Nb
     
    2
    		O
     
    6
    		(OH,F)
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888] [Mineralogical Magazine, August 2003, V. 67, N° 4, pp. 749-767]
    Site Photo
    Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal
    © Paolo Grosso
  		•  'Pyroxene Group'
    Reference: []
    Site Photo
    Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal
    © Rui Nunes 2006
  		•  Quartz
    SiO
     
    2
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  Sanidine
    K[AlSi
     
    3
    		O
     
    8
    		]
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888.]
    Site Photo
    Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal
    © GiovanniFraccaro
  		•  Sodalite
    Na
     
    8
    		[Cl
     
    2
    		|Al
     
    6
    		Si
     
    6
    		O
     
    24
    		]
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]
  		•  Thorite
    (Th,U)[SiO
     
    4
    		]
    Reference: [Mineralogical Magazine, August 2003, V. 67, N° 4, pp. 749-767.]
  		•  Titanite
    CaTi[O|SiO
     
    4
    		]
    Reference: [Ternes, B., Mineralien von der Azoreninsel Sao Miguel, Lapis, 20-42, 1999]
    Site Photo
    Agua de Pau volcano (Fogo volcano), San Miguel Island, Azores District, Portugal
    © GiovanniFraccaro
  		•  Zircon
    Zr[SiO
     
    4
    		]
    Reference: [Osann, A.: Über Sanidinite von Sao Miguel, Neues Jahrbuch für Mineralogie 1, 117-130, 1888]


    35 entries listed. 30 valid minerals.

    Localities in this Region:
    Portugal
     
    • Azores District
      • San Miguel Island
        • Agua de Pau volcano (Fogo volcano)

    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!
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