The specimen above is a typical granite.
Can you find granite in michigan.
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Michigan was the nation s largest producer of copper from 1847 to 1877 according to michigan state university.
Here s how it happens.
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The black grains can be biotite or hornblende.
The grain size is coarse enough to allow recognition of the major minerals.
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As the feldspar minerals in granite begins to crystallize the process is disturbed when the molten rock is quickly erupted freezing the well formed feldspar crystals in place while the rest of the rock quickly cools and fills in.
Dorr eschman university of michigan press ann arbor michigan.
Here are the names of some of those commonly.
Numerous other minerals can be present in granite.
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The pink grains are orthoclase feldspar and the clear to smoky grains are quartz or muscovite.
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The copper ore rich rocks lived in rock layers deep in lake superior.
Matrix it is given a compound name for example granite porphyry or porphyritic granite and basalt porphyry or porphyritic basalt.
My guide books say it can range from black to gray or a mixture of black and light crystals.
It is about two inches across.
As granite is the coarse grained slow cooling cousin of rhyolite gabbro is the coarse cousin of basalt formed deep underground as granite.