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Pumice is an extrusive igneous rock (meaning that it is formed when lava breaks through the earth's crust and hardens on contact with the air). This also means that deposits are found very close to the Earth's surface, and is mined using the drift mine method, in which an open pit is dug. Pumice is removed from the pit as ore, which is a large piece of rock containing the mineral, and is tehn sifted and separated.

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13y ago

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