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30-Dec-2019 04:36

Volcanic rocks, because they are able to cool and crystalize rapidly, have a very fine-grained texture; the individual mineral grains are too small to see easily with the naked eye.Plutonic rocks on the other hand cool very slowly, on the order of a million years or more for some deeply buried and insulated magmas.Sometimes the minerals segregate into distinct bands.

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Gentry has spent most of his professional life studying the nature of very small discoloration features in mica and other minerals, and concluded that they are proof of a young Earth.The mineral grains in these rocks can grow very large and are readily distinguished in hand samples.