How do lapilli form?

Lapilli are small volcanic fragments, typically ranging from 2 to 64 millimeters in diameter, that form during explosive volcanic eruptions. They are created when gas-charged magma is violently expelled from a volcano, causing it to fragment into small pieces as it cools and solidifies in the air. These fragments can include a mixture of volcanic glass, pumice, and mineral grains. Once they fall back to the ground, they can accumulate around the volcano, contributing to the formation of volcanic deposits.