Question

Suppose you found an igneous rock that had almost even amounts of silica, iron, and magnesium. How would you classify this rock? Why?

Answer 1

An igneous rock composed of "almost even amounts of silica, iron and magnesium" would, by definition, contain 33.3% SiO2, 33.3% Fe, and 33.3% Mg.

The only thing that is important from a classification standpoint here is the unusually low SiO2 concentration. Plutonic rocks with less than 45% SiO2 are called ultramafic, such as peridotite.

Answer 2

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Answer 3

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Answer 4

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Answer 5

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Answer 6

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