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A zeolite with a chemical composition approximating K₂ Mg₂ Ca₁.₅ Al₉.₅ Si₂₅.₅ O₇₂ ·28H₂ O, which crystallizes in the hexagonal system and occurs naturally as clusters of minute needles inside cavities in igneous rocks.
1970s. From the name of Fiorenzo Mazzi, Italian mineralogist + -ite.