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Foliated Biotite Quartz Monzonite
Place Collected:Memorial Bridge, Cold Brook, Randolph, New Hampshire
Object number: BILLINGS-MW-31
DescriptionMedium-grained quartz monzonite containing a large amount of biotite (≤ 3 mm). Sample also contains muscovite (≤ 1.5 mm), K feldspar, plagioclase, and minor amounts of quartz. Sample is slightly foliated as seen with the alignment of the biotite.