hyaloclast

Etymology
From.

Noun

 * 1)  A volcanic glass fragment formed by hot lava rapidly cooling when it encounters water or ice, causing it to shatter into small, glassy pieces.
 * 2) * 1987, Brian J. Taylor, ‎N. F. Exon, Marine Geology, Geophysics, and Geochemistry of the Woodlark Basin-Solomon Islands (page 300)
 * Suite IV represents sediment gravity flow deposits near a deep submarine vent, whereas Suite V represents a mixture of hemipelagic mud and epiclastic sand which incorporated some hyaloclasts.
 * Suite IV represents sediment gravity flow deposits near a deep submarine vent, whereas Suite V represents a mixture of hemipelagic mud and epiclastic sand which incorporated some hyaloclasts.