Oak Hill Quarry, Oak Hill, Westford, Middlesex Co., Massachusetts, USA
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Granite quarry near the north end of Oak Hill, opened ca. 1830. There are dikes of pegmatite and aplite.
6 valid minerals.
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Dale, T. N. (1910). Supplementary Notes on the Commercial Granites of New England (in Contributions to Economic Geology, USGS Bulletin 470).