Friday, May 29, 2015

Granitic Gneiss

Rocky  Neck State Park, Niantic, CT  2015

This boulder is typical of the geology found at Rocky Neck State Park.  It's granitic gneiss, a metamorphic rock which forms under intense heat and pressure.  Minerals found in this gneiss can include quartz, garnet, tourmaline and biotite.  The gneiss found here is a part of a large formation of rocks known as Potter Hill Granite Gneiss.

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