Most pumice erupts from magmas that happen to be very charged with gas and have a rhyolitic composition. Almost never, pumice can erupt from gas-charged magmas of basaltic or andesitic composition. The largest volcanic eruptions can eject a lot of cubic kilometers of material. This material can range in size https://moodjhomedia.com/story2787003/5-tips-about-pumice-stone-wholesalers-you-can-use-today