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Quabbin Aqueduct Shaft #10 locality, Hardwick, Worcester Co., Massachusetts, USA

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Latitude & Longitude (WGS84): 42° 22' 59'' North , 72° 9' 34'' West
Latitude & Longitude (decimal): 42.3830555556, -72.1594444444

A large rock dump left by the construction of a water tunnel (Quabbin Aqueduct).

Mineral List

Regional Geology

Silurian-Devonian358.9 - 443.8 MaSilurian-Devonian sedimentary rocks

Sedimentary rocks

Early Devonian393.3 - 419.2 MaHardwick Tonalite

Major:: {granitic gneiss}

Hardwick Tonalite - Dark-gray, moderately to strongly foliated biotite tonalite to granodiorite gneiss; intrudes Dl.

Part of Merrimack Belt (Silurian, Devonian and Pennsylvanian Rocks)

Ordovician443.8 - 485.4 MaOrdovician sedimentary


References for regional geology:

Data provided by

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

24 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Shaub, B. M. (1941): Occurrence and Origin of Babingtonite and Other Minerals From Quabbin Aqueduct, Massachusetts (American Mineralogist 26:121.)

Hiller, John (1974). Massachusetts Mines and Minerals. (priv. pub.)

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