Fluorapophyllite-(K), tobermorite, thomsonite-(Ca)

A cavity in the volcanic rock is filled with large white crystals of fluorapophyllite, white spherical aggregates of tobermorite, and brownish radial thomsonite. The apophyllite crystals are over 1.5 cm large, the hemisphere of tobermorite on the side of the sample measures 16 mm in diameter. The entire zeolite cavity is 7 cm long. A rich sample of silicates from the Cvikov locality near Česká Lípa. The specimen has been trimmed by cutting.