Most pumice erupts from magmas that happen to be extremely billed with gas and also have a rhyolitic composition. Almost never, pumice can erupt from gasoline-charged magmas of basaltic or andesitic composition. This rush of gas in the vent shreds the magma and blows it out as a molten froth. https://bookmarkangaroo.com/story19533161/not-known-facts-about-pumice-stone