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

[Latin, diminutive of lapis, stone.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Detailed microscopic examination of the volcaniclastic (epiclastic) deposits was carried out, discriminating them into accretionary lapilli tuff and finer grained hyaloclastite tuffs.
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.