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Dark igneous rock, such as basalt, contains iron (note the rusty color of the weathered rock) and magnesium.

2007-10-28 10:20:58 · answer #1 · answered by Howard H 7 · 0 0

iron and magnesium, maybe a little carbon and silicon

2007-10-28 19:48:29 · answer #2 · answered by 22 4 · 0 0

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