What are tiny pieces of lava called and the answer is eleven letters long

Tiny pieces of lava are called pyroclastic. It consists of deposits of pumice-rich also known as ignimbrites, and pyroclastic eruption consts of spitting or fountaining lava, where the lava will be thrown into the air along with ash, pyroclastic materials, and other volcanic byproducts.

The tiny pieces of lava are called pyroclastic. Frequently formed of rock fragments of volcanic source or comminuted throughout an explosion.