Definition of pyroclast
An individual particle ejected during a volcanic eruption. It is usually classified according to size:
Ash: <2mm
Lapilli: 2-64mm
Bombs and blocks: >64mm, rounded and angular respectively
Ref: AGI
Ash: <2mm
Lapilli: 2-64mm
Bombs and blocks: >64mm, rounded and angular respectively
Ref: AGI