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25 April, 10:41

How can you tell if the rock is igneous?

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  1. 25 April, 13:41
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    Determine the color (indicates mineral composition)

    Determine the texture (indicates cooling history)

    Phaneritic: large grains.

    Aphanitic: small grains (too small to identify with the naked eye)

    Porphyritic: fine grains mixed with larger grains.

    Vesicular: holes.

    Glassy: glass-like.

    Explanation:

    Things like this determine if its igneous or not.
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