Duffy Granite quarry, Concord, Merrimack Co., New Hampshire, USAGranite quarry on Rattlesnake Hill, opened in 1906.
ReferencesDale, T. N. (1908). The Chief Commercial Granites of Massachusetts, New Hampshire, and Rhode Island (USGS Bulletin 354.)
| Microcline|| Muscovite|| Quartz|
3 entries listed. 3 valid minerals.
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