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What rocks are impermable?

Updated: 11/1/2022
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11y ago

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As a general rule, igneous rocks are impermeable. Metamorphic rocks may also be impermeable, but this will depend on the mineralogy and level of metamorphism. These rocks are impermeable because they have crystals which interlock, forming a watertight structure. This is the rule, but there are exceptions. Sedimentary rocks tend to be permeable or porous, and many will even dissolve, or their cement will dissolve in water. This is because of their often clastic structure which has some holes in it.

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8y ago

Impermeable rocks are those through which gas and fluids do not travel freely.

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