Milford pink granite

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Milford pink granite
Igneous rock
Milford Pink Granite.jpg
Silicon dioxide, Aluminium oxide, Iron(III) oxide, Manganese(II) oxide, Calcium oxide, Magnesium oxide, Potassium oxide, Sodium oxide, Biotite[1]

Milford pink granite, also known as Milford granite or Milford pink is a Proterozoic igneous rock located in and around the town of Milford, Massachusetts, covering an area of approximately 100 km2, as mapped by the USGS.

From 1870 to 1940, the town of Milford became famous for the "pink" variety of this stone, prized as a building material. According to local legend, the granite was "discovered" in the early 1870s by two brothers, James and William Sherman at Rocky Woods in Milford.[2] At its peak, over 1,000 men labored in dozens of quarries in Milford and nearby Hopkinton.

Milford pink granite is quarried by the Fletcher Granite Company, at their Lumber Street quarry in Hopkinton, Massachusetts.[3]


The granite is described as a light gray or light pinkish-gray to a medium, slightly pinkish or pinkish and greenish-gray biotite granite with spots from 0.2 to 0.5 inch across and in some cases tapering out to an inch in length.[1] The biotite is typically in clots or short streaks. It is commonly locally gneissic.[4] The color of the stone is governed mainly by its feldspars, pink from the potash and green from the soda lime feldspar.[1]

Examples of use[edit]

American Museum of Natural History, New York (1869)
Flour and Grain Exchange Building, Boston (1892)
Boston Public Library under construction, 1889

See also[edit]


External links[edit]