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Scoria has bigger vesicles and thicker vesicle walls than pumice, and has a specific gravity greater than water. Pumice has a specific gravity less than water. Therefore, scoria will not float and pumice will.
First answer by Jones1rocks. Last edit by Jones1rocks. Contributor trust: 111 [recommend contributor]. Question popularity: 1 [recommend question]
Answers.com > Wiki Answers > Categories > Science > Earth Sciences > Geology > What is the difference between scoria and pumice?
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Difference of scoria and pumice?
