This historic site was noted for its terminated spodumene crystals, collected in the mid- to late-1800s and now found in museums around the world.
Ref.: Emerson, B. K. (1917): Geology of Massachusetts and Rhode Island, USGS Bulletin 597, p.257.
Ref.: Shaub, B. M. (1954): Walnut Hill Spodumene Ledge Near South Worthington, Massachusetts (Rocks & Minerals 29-339)