Clinoptilolite-Ca Ca₃(Si₃₀Al₆)O₇₂·20H₂O
Erionite-K K₁₀(Si₂₆Al₁₀O₇₂)·30H₂O
Pyrite Fe²⁺(S₂)₂-
Colorless blocky crystals of clinoptilolite-Ca growing on acicular erionite-K crystals. There are 3 acicular pyrite crystals in lower half of image.
FOV = 3.0 mm
Collected by Rudy Tschernich.