A pale greenish-grey variety of Montmorillonite.
Originally reported from Toal de Rizzoni, Monzoni Mts, Fassa Valley, Trento Province, Trentino-Alto Adige, Italy.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.