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Why does granite exfoliate?

Updated: 11/17/2022
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13y ago

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Granite is formed from the 3 main minerals quartz, plagioclase and biotite/amphibole. In a desert environment when sun is the predominant weather, a granite outcrop will heat to a very hot temperature, causing expansion and contraction of the minerals. The minerals will expand and contract at different rates due to their chemical compositions being different to each other. This causes the surface of the granite to cause a cracking and splitting like texture, similar to a rough coarse sandstone feel. It is also known as onion skin weathering as layers of the rock will appear to peel itself off, one at a time.

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13y ago
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Q: Why does granite exfoliate?
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