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Gray Biotite Granite
Place Collected:Ravine House, Randolph, New Hampshire
Object number: BILLINGS-MW-121
DescriptionGray fine-grained biotite rich granite. According to M.P. Billings this was an unusual facies for the binary granite. Biotite is ≤ 1 mm. Some plagioclase are ≤ 6 mm with most being ≤ 1 mm.