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English
Etymology
From hyalo- + -clast.
Noun
hyaloclast (plural hyaloclasts)
- (geology) A volcanic glass fragment formed by hot lava rapidly cooling when it encounters water or ice, causing it to shatter into small, glassy pieces.
1974, Acta Geologica, volume 18, page 388:Hyaloclasts occur partly between the individual lava flows, partly in the vents penetrating the volcanic formations.
- 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.