Mica schist (Manhattan Schist, late Neoproterozoic; Manhattan Island, New York City, New York State, USA)
Mica schist from the Precambrian of New York State, USA. (4.6 centimeters across at its widest)
Manhattan Island, in the heart of New York City, seems prima facie an unlikely place for seeing geology. However, nice rock outcrops occur in several city parks, including the largest, Central Park. The bedrock in Manhattan is principally high-grade metamorphic rocks, such as gneisses, schists, and marbles. The rock shown here is a typical mica schist that comes from the late Neoproterozoic Manhattan Schist.
Locality: unrecorded site on Manhattan Island, New York City, southeastern New York State, USA