Cahnite, Apophyllite Group, Vonsenite
Vallerano Quarries, Valleranello, Rome, Metropolitan City of Rome Capital, Lazio, Italy
Pseudo-octahedral sphenoid crystals, typically twinned, of beige cahnite, grown on packets of white, tabular, tetragonal 'apophyllite' crystals and associated with black needles of vonsenite. For apophyllite, see: Paolo Rossi, Edgardo Signoretti, Roberto Pucci "The minerals of the Vallerano quarries", Il Cercapietre 2000, n ° 1-2, page 7. ...