Lapilli
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Lapilli are small particles of solidified lava (tephra) thrown into the air by volcanic eruptions.
In addition to accretionary lapilli, there is another kind of volcanic lapilli that are spheroid, teardrop, dumbbell, or button shaped. These granules are not accretionary, but are the direct result of liquid rock cooling as it travels through the air. Lapilli can range in size from 2 mm in diameter to 64 mm in diameter.