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How does granite form?

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Quick Answer

As of 2014, geologists contend that granite is a plutonic rock resulting from deeply buried shale and sandstone that melted, partially melted or metamorphosed, depending on the category of granite in question. Igneous granite forcefully ripped through the Earth's crust, while metamorphic has no evidence of fluidity.

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How does granite form?
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Rhyolite, formed from granite and magma, only exists in the continental crust, especially in the mountains. It has not been found in any ocean. Eighty percent of granite is composed of large, coarse grains of potassium feldspar, sodium feldspar and quartz. During the late stages of cooling, hydrothermal solutions carried veins of gold, silver, zinc, lead and copper ores throughout the fissures, the fractures and along the periphery of the granite body.


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    How are shale and sandstone different?

    A:

    The major difference between shale and sandstone is the type of materials from which they are formed and the size of the particles. Shale is made primarily from clay and has a much finer grain that sandstone. Sandstone is made primarily of sand and has a larger grain.

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