In palagonite tuffs, in the cement of pyroclastics or replacing plant stems.
Volcanic bombs composed of nepheline basalts, dunite, peridotite and garnet-rich peridotite can be found included in the Tuff from the upper mantle.
References
Journal of Petrology Volume 16 Pages 134-153, 1975
Tschernich, R. (1992): Zeolites of the World, 65, 114
Mineral List
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