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Lapilli
Small pyroclast debris thrown in the air by a volcanic eruption / From Wikipedia, the free encyclopedia
Lapilli (sg.: lapillus) is a size classification of tephra, which is material that falls out of the air during a volcanic eruption or during some meteorite impacts.[1] Lapilli is Latin for "little stones".
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By definition lapilli range from 2 to 64 mm (0.08 to 2.52 in) in diameter.[2] A pyroclastic particle greater than 64 mm in diameter is known as a volcanic bomb when molten, or a volcanic block when solid. Pyroclastic material with particles less than 2 mm in diameter is referred to as volcanic ash.[3][4]