Purchasing, if possible, the New England artifact guide, as published by the Massachusetts Archaeological Society, and available online, as well as at their Robbins Museum; as well as either the short or expanded edition of the late Jeff Boudreau's guide to New England projectile points, available from the aforementioned sources, would be a good decision moving forward.
Visiting the Robbins Museum would allow you to view examples of virtually every class of artifact found in southern New England. There just is no substitute for viewing as many genuine examples of artifacts from your own neck of the woods. Private collections when possible, any public collections, guide books, etc. But the Robbins has the largest collection that is available for public viewing.
And I agree, the piece of quartz is just a natural pebble.
