05-25-2008, 01:19 PM
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Some rocks will explode regardless of how fast or slow you boil them. It is an issue of the composition of the rock, how pourous it is and how fast it can relases the gasses from the water boiling inside of them. Water inside the rock will boil and it will build pressure and explode, period. I have seen them experimented with and it simply doesn't matter.
The rest of the water doesn't even have to boil because the rock touching the bottom of the pan can heat it faster than the water and the rock could explode anyway.
As the water INSIDE the rock boils it expands and if the gases can not escape fast enough then the rock explodes. Igneous, sedimentary, composite or whatever it doesn't matter. The only rocks that technically can't explode like this are any of them that are completely non-pourous.
It just simply make no sense to boil them when there are safer ways to do it. Pour boiling water over them, wash them in alcohol, and other ways to make them safe that doesn't put you in danger of bodily harm.