Brockton Heights Quarry, Brockton, Plymouth County, Massachusetts, USAi

Regional Level Types
Brockton Heights Quarry	Quarry
Brockton	City
Plymouth County	County
Massachusetts	State
USA	Country

The Brockton Heights quarry is on Pearl Street, Brockton Heights, about 2 1/2 miles west of Brockton station in the same township. Operator: Brockton Pink Granite Co., room 530, Old South Building, Boston, Mass.

The granite is a biotite-hornblende (or altered augite-hornblende) granite of light greenish-gray color with large pink spots and matrix of medium texture (feldspars up to 0.3 inch and mica up to 0.2 inch) and with porphyritic light pink feldspars up to 0.8 inch. The constituents of the matrix, in descending order of abundance, are milk-white to greenish soda feldspar (albite), much micasized; clear colorless to slightly milky quartz with cavities in sheets; chlorite, probably after biotite (possibly after augite); a little microperthite (potash feldspar (microcline), minutely intergrown with soda feldspar (albite), kaolinized, with epidote and zoisite in microscopic particles); and yellow hornblende in fibrous radiating crystals. The large pink crystals are also microperthite and contain sparse groups of yellow hornblende crystals. Accessory: Magnetite and titanite. Secondary: Epidote, zoisite,.plentiful carbonate, chlorite, a white mica, kaolin, and quartz. There are veinlets of carbonate, epidote, and quartz. The stone effervesces with hydrochloric-acid test.

The quarry, opened in 1900, is 20 feet square and 15 feet deep. The areal extent of the rock is reported as about 7 acres, which probably only signifies the extent of the outcrops.