The specimen above is a typical granite.
Can you find granite in michigan.
The copper ore rich rocks lived in rock layers deep in lake superior.
It is about two inches across.
For more information see the geology of michigan 1991.
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You can clearly see this in the sample i have provided above found on a lake michigan beach.
Petoskey isn t the only stone on the beach and the lake michigan shoreline from south haven to st.
As granite is the coarse grained slow cooling cousin of rhyolite gabbro is the coarse cousin of basalt formed deep underground as granite.
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Numerous other minerals can be present in granite.
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Matrix it is given a compound name for example granite porphyry or porphyritic granite and basalt porphyry or porphyritic basalt.
Here s how it happens.
The black grains can be biotite or hornblende.
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.
Joseph offers wonderful stones for rock collectors.
Dorr eschman university of michigan press ann arbor michigan.
My guide books say it can range from black to gray or a mixture of black and light crystals.
Michigan was the nation s largest producer of copper from 1847 to 1877 according to michigan state university.
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