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Your specimen is probably pumice. Pumice is very
distinctive; it is usually grey (but can have yellow or brown areas), full of
holes and is very light. Pumice forms when frothy lava erupts out of a volcano
and cools very quickly, trapping the air bubbles. Pumice is often found in
volcanic areas of Italy and can sometimes been seen floating in the sea.
A number of igneous rocks from The Potteries Museum &
Art Gallery collections are featured on the
Virtual
Store.
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