Dachiardite-Ca

Formula: (Ca,Na2,K2)5Al10Si38O96·25H2O From Alfredo Petrov: DACHIARDITE-Ca (kai-dakiarudi-fusseki) Above: Dachiardite-Ca, Hokiya-dake, Toyosaka, Matsushiro, Nagano City, Nagano Prefecture, Japan. Width of view 6mm. Labelled as Mt Hokidoke, Nagono Volcano, Japan. Colourless prismatic crystals.