Formula: (Ca,Na2,K2)5Al10Si38O96ยท25H2O
From Alfredo Petrov:
DACHIARDITE-Ca (kai-dakiarudi-fusseki)
- Shizuoka: It has been suggested that some or all of the “epistilbite” reported from Toi, with yugawaralite and calcite in vugs in propylite, may actually be dachiardite because of some incompatibility between the conditions of formation of yugawaralite and epistilbite.
- Tokyo: At Hatsuneura on Chichijima in the Ogasawara islands, along with calcian dachiardite-Na, where they form radiating aggregates of platy prismatic crystals in chalcedony veins transecting altered mafic pillow lava. Associated with mordenite. One analysis corresponds to (Ca 1.77, Na 1.24, K 0.49) (Al 4.80, Si 19.08) O 48 (H2O) 12.10 (Nishido and Otsuka, 1981).
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.
