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Sure. If you can find a fluid that's more dense than the rocks to float them in.

For example, Mercury is almost 6 times as dense as granite, so a lump or slab of granite will ride right up there high in a pool of mercury.

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Pumice, it has air pockets in it. If the weight to water displacement is less any object will float.

answ3. Heavy liquids are used in mineral separation. A poly-bromine - ... etc liquid used to be used , but considerations of ozone layer, and toxicity have led to it being abandoned.

Sodium polytungstate, with a specific gravity of about 3 is now the recommended material. And, some rock minerals will float on it - hence its value.

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14y ago

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