Pumice washes ashore at Double Island Pt
PUMICE stretching for kilometres has been washed ashore at Double Island Pt over the past two weeks.
The Gympie Times reader Ernest Young took photos of the pumice and submitted them to the paper.
He said he had never seen so much pumice washed ashore on the southern side of the point.
"It went for about 30km," Mr Young said.
Pumice is created when super-heated, highly pressurized rock is violently ejected from an undersea volcano.
The unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid depressurization.
The depressurization creates bubbles by lowering the solubility of gases that are dissolved in the lava, causing the gases to rapidly exsolve, like the bubbles of CO2 that appear when a carbonated drink is opened.
The simultaneous cooling and depressurization freezes the bubbles in the matrix forming an extremely light weight stone.
It then floats on the surface of the ocean.