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'
Augite
'Bentonite'
Biotite
Cristobalite

Illite
Kaolinite
'K Feldspar'
Mordenite
Opal

Quartz
Sanidine
'Smectite Group'
Tridymite

14 entries listed. 9 valid minerals.

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