Difference between revisions of "Artificial Minerals"
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| − | == Man-made Minerals | + | == Man-made Minerals == |
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| + | See "Minerals" Geology, or "Boxes of Rocks" | ||
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*[[Asphalt]] | *[[Asphalt]] | ||
*[[Cement]] in use since Roman times. | *[[Cement]] in use since Roman times. | ||