lapillus

small stone ejected by volcanic eruption
Found on http://phrontistery.info/l.html

lapillus

unconsolidated volcanic fragment with a diameter between 4 and 32 mm (0.16 and 1.26 inches) that was ejected during a volcanic explosion. Lapilli may ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/l/15
No exact match found