rock (composed of over 35% mafic minerals) in which the quartz-feldspar-feldspathoid fraction of the rock is less than 20% quartz and less than 10% feldspathoid, and in which plagioclase is between 65% and 90% of the total feldspar content.

Occurrence

Trachybasalt is common in continental volcanism and is also found on some ocean islands. It is abundant at Mount Etna

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