|Silicon dioxide, Aluminium oxide, Iron(III) oxide, Manganese(II) oxide, Calcium oxide, Magnesium oxide, Potassium oxide, Sodium oxide, Biotite|
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. At its peak, over 1,000 men labored in dozens of quarries in Milford and nearby Hopkinton.
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. The biotite is typically in clots or short streaks. It is commonly locally gneissic. The color of the stone is governed mainly by its feldspars, pink from the potash and green from the soda lime feldspar.
Examples of use
- Bancroft Memorial Library, Hopedale (1898)
- Boston Public Library, McKim Building, Boston (1895)
- Flour and Grain Exchange Building, Boston (1892)
- Memorial Hall, Milford (1884)
- Town Hall, Hopedale (1886)
- Worcester City Hall, Worcester (1898)
- New York City
- American Museum of Natural History (1869)
- Brooklyn Museum, Brooklyn (1895)
- General Post Office Building (1912)
- Pennsylvania Station (1910)
- University Club of New York (1899)
- Washington, D.C.
- T. Nelson Dale (1923). "The Commercial Granites of New England" (PDF). United States Geological Survey. Retrieved August 22, 2017.
- Blackstone River Valley Archived 2008-09-07 at the Wayback Machine
- USGS Milford Granite
- Hopedale Town Hall
- Milford Daily News, May 31, 2008
- "Milford Pink Granite". City University of New York. Retrieved June 2, 2017.
- Work on the Future of Pennsylvania Station Unearths a Bit of Its Past, The New York Times, November 8, 1998.
- "Milford Pink granite". Museum of Fine Arts, Boston. Retrieved August 22, 2017.