Batu apung vulkanik. Jenis batuan adalah salah satu batuan yang bisa mengapung, dan mungkin telah melayani sebagai rakit untuk mikroorganisme yang muncul di lautan purba sekitar 3,5 miliar tahun lalu. Oxford Profesor Martin Brasier menjelaskan :
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"Not only does pumice float as rafts but it has the highest surface-area-to-volume ratio of any type of rock, is exposed to a variety of conditions, and has the remarkable ability to adsorb metals, organics and phosphates as well as hosting organic catalysts, such as zeolites. Taken together these properties suggest that it could have made an ideal 'floating laboratory' for the development of the earliest micro-organisms."
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