Porphyritic Biotite Quartz Monzonite
Place Collected:South ridge of Cherry Mountain, New Hampshire
Object number: ROC122862
DescriptionPorphyritic biotite quartz monzonite containing biotite (≤ 2 mm), plagioclase, and phenocrysts of microcline (≤ 1.2 cm, potassium rich alkali fedspar). Sample is weathered and discolored on the side that the label is painted on.