Hyaloclast

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 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.

    "Hyaloclasts occur partly between the individual lava flows, partly in the vents penetrating the volcanic formations."

Example

More examples

"Hyaloclasts occur partly between the individual lava flows, partly in the vents penetrating the volcanic formations."

Etymology

From hyalo- + clast.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.