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defined tuffites as rocks containing 50% to 90% volcanic fragments. Tuffite should therefore contain more than half volcanic material. If rock contains more than 75% to 90% pyroclastic material, it is referred to as tuff. Some other, mostly older, sources state that tuffite may contain 10% to 50%
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Le Maitre (Editor), 2002, Igneous rocks A Classification and
Glossary of Terms Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks. Cambridge University Press, Cambridge, p.
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Schmid, R. (1981). "Descriptive nomenclature and classification of pyroclastic deposits and fragments: Recommendations of the IUGS Subcommission on the
Systematics of Igneous Rocks".
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There are several classifications that define tuffite. The classification in the IUGS recommendation is based on the definition established by Schmid (1981).
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Vozárová, A., 2009, Petrohraphy of sedimentary rocks. Comenius
University Press, Bratislava, Bratislava, 173 pp. (in Slovak)
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definition, tuffite contains 75% to 25% volcanic (epiclastic) material.
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is used for sediments containing less than 25% volcanic fragments.
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A tuffite consists of angular and/or rounded fragments of
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Tuff containing both pyroclastic and detrital materials
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