Tuffite should therefore contain more than half of volcanic material.
2.
There are several classifications that define tuffite.
3.
According to IUGS definition tuffite contains 75 % to 25 % volcanic ( epiclastic ) material.
4.
Some other, mostly older sources state that tuffite may contain 10-50 % volcanic material.
5.
A tuffite consists of angular and / or rounded fragments of effusive rocks and their minerals, also may contain volcanic ash, pumice and clay minerals.
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