One of the sites I visited with the Wayne County Gem and Mineral Club during the June Massachusetts trip was the large dump beside the Quabbin Aqueduct shaft #10 in Hardwick, Massachusetts. The 25 mile aqueduct connecting the Quabbin Reservoir to Boston was completed in 1939 and has been a primary source of water for the Boston region ever since. Rocks excavated from the #10 shaft include the Hardwick granite, the Monson gneiss, and a number of other metamorphic rocks. The dump is expansive and although it is becoming overgrown it remains a popular site for mineral collectors.
The almandine garnets in the biotite schist are brightly pink and the bright green epidote coating granite fractures is equally vibrant. But until I got home I did not know that several of the fracture linings had sub mm-sized, brilliantly purple fluorites resting on the epidote.
The site is best known for babingtonite, a rare calcium-iron-manganese silicate, which is also the state mineral of Massachusetts. It is also generally found in very small crystals and I had hoped I might encounter some when I cleaned the epidote-fracture coated pieces I carried out and looked at them carefully. But alas, no babingtonite for me and I must share a picture that Peter Cristofono posted to Mindat in 2010.