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Old 04-06-2013, 03:53 PM   #21
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Originally Posted by taxlady View Post
Like pumice?

Runs and hides.
Letís Talk Water - Porosity

By Dr. Mike Strobel

Igneous and metamorphic rocks typically have very low values of porosity. For igneous rocks, such as granites and basalts, the low porosity is because the rocks were formed from the cooling of molten magma. As the rocks formed, the crystals in the magma interlocked and formed tight bonds. This does not allow for much pore space.
One exception would be volcanic rocks, which are full of hot gases when they form. These rocks can have abundant pores due to the gas bubbles present as the lava cools and the rock forms.

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