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Here is a good article on the types of rocks that explode: http://www.ehow.com/list_7360348_rocks-explode-around-fire-pits.html Generally if you rub two of the same rocks together and they crumble...
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Here is a good article on the types of rocks that explode: http://www.ehow.com/list_7360348_rocks-explode-around-fire-pits.html Generally if you rub two of the same rocks together and they crumble...