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n. pl. la·pil·li (-pĭl′ī′)
A small, solidified fragment of lava.

[Latin, diminutive of lapis, stone.]
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Petrographically the section was discriminated between accretionary lapilli tuffs, fine hyaloclastite tuffs and mudstones cycles.
Others include that they may be accretionary lapilli formed in volcanic ash eruptions, impact spherules formed in impact events, or devitrification spherules resulting from formation of crystals from formerly melted material.
Accretionary lapilli are uncommon, suggesting water contents of the surges were low.