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Biotite-muscovite Granite
Place Collected:Pinkham B Road, Gorham, New Hampshire
Object number: BILLINGS-MW-7
DescriptionIgneous rock composed both muscovite (≤ 3 mm) and biotite (≤ 2 mm). Sample also contains quartz (≤ 2 mm), plagioclase, and feldspar. A portion of the rock is discolored most likely due to exposure to the elements.