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Cala Fontana old quarry, Ponza Island, Latina Province, Latium, Italy

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Diagenetically altered silica-rich vitric rhyolite (hydrolysis of vitric material in hydrological open system).
The rhyolite crops out beneath a thick layer of clay (smectites, bentonite, opal C).





Mineral List:
  		•  'Albite-Anorthite Series'
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Augite
    (Ca,Na)(Mg,Fe
    2+
     
    		,Al,Fe
    3+
     
    		,Ti)[(Si,Al)
     
    2
    		O
     
    6
    		]
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  'Bentonite'
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Biotite
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Cristobalite
    SiO
     
    2
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Illite
    K
     
    0.65
    		A
     
    2.0
    		 [][Al
     
    0.65
    		Si,
     
    3.35
    		O
     
    10
    		](OH)
     
    2
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Kaolinite
    Al
     
    2
    		Si
     
    2
    		O
     
    5
    		(OH)
     
    4
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  'K Feldspar'
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Mordenite
    (Na
     
    2
    		,Ca,K
     
    2
    		)Al
     
    2
    		Si
     
    10
    		O
     
    24
    		·7H
     
    2
    		O
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Opal
    SiO
     
    2
    		·nH
     
    2
    		O
    Description: Opal C, replaced by cristobalite.
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Quartz
    SiO
     
    2
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Sanidine
    K[AlSi
     
    3
    		O
     
    8
    		]
    Description: Pyrogenic.
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  'Smectite Group'
    A
     
    0.3
    		D
     
    2-3
    		[T
     
    4
    		O
     
    10
    		]Z
     
    2
    		·nH
     
    2
    		O
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]
  		•  Tridymite
    SiO
     
    2
    Reference: [E. Passaglia et al. , Eur. Journ. Mineral. , 1995, 7, pp. 429-438.]


    14 entries listed. 9 valid minerals.

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