Pyritiferous Mica Schist
Credit Line: Mineralogical and Geological Museum at Harvard University
Object number: BILLINGS-MW158
DescriptionMetamorphic rock containing small mica grains (≤ 0.5 mm) creating a sheen when viewing perpendicular to the foliation. Dark brown areas are signs of weathering. Pyrite is not visible in hand sample. Crenulation is visible.