Hyaloclastite

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What Wikipedia says

Hyaloclastite is a volcanoclastic accumulation or breccia consisting of glass (from the Greek hyalus) fragments (clasts) formed by quench fragmentation of lava flow surfaces during submarine or subglacial extrusion.

Excerpt from the Wikipedia article “Hyaloclastite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: USGS, Public domain, via Wikimedia Commons.