ignimbrite

noun Petrology.

1. a fine-grained volcanic rock consisting mainly of welded shards of feldspar and quartz.

noun

1. a rock formed by the deposition at high temperature and the consolidation of a nuée ardente or other type of ash flow, being a complicated mixture of volcanic materials welded together by heat, hot gases, and pressureAlso called: welded tuft See tuft

1. A volcanic rock formed by the consolidation of volcanic ash and other material ejected by an explosive volcanic eruption.