From an offline-only article in Archaeology entitled “Romans on the Bay of Naples,” by Marco Merola, comes the word lapilli:
A team of archaeologists and conservators worked to remove mud and lapilli (small stones ejected by a volcanic eruption) and to expose and clean the stunning wall paintings emerging from the debris.
Having been to Naples, Herculaneum, and Pompeii many years ago, I was fascinated by the article, picturing the work near the magnificent Bay of Naples, wondering just what the villa looked like in its day.
Before the lapilli started falling.