Reticulite, a highly vesicular form of pumice, is so fragile it can be sliced in half with a Post-it note! Reticulite from a volcanic eruption of Kilauea is contrasted with lava flows, and with carbonated soda. It can be crushed in your bare hands, or flattened with a plastic spoon; a plastic fork goes right through it. Visit our web site at www.uhh.hawaii.edu