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Pumice
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Type Igneous
Essential mineral(s) {{{Essential mineral(s)}}}
Accessory mineral(s) {{{Accessory mineral(s)}}}

Pumice is an igneous rock. It is the only known rock that can float on water, due to large airpockets in its core. It is mainly used as a grinding stone, to polish jewelery or sharp objects such as knives. Pumice is also used in making cinder blocks.

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