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Massachusetts Hornfels-Braintree Slate Quarry, Milton and Quincy, Massachusetts, NRHP-listed, archaeological site used from 7,000 B.P. until the early 17th century as a source of slate and hornfels used for chipped and ground tools. W.N. Flynt Granite Co., in Monson, Massachusetts, a granite quarry that opened in 1809 and operated until 1935 ...
^ Florida's state gem, moonstone, was adopted to highlight Florida's role in the United States' Lunar program, which landed the first astronauts on the Moon. [81] ^ Since 1983, Massachusetts has had 3 other official state rocks: State Historical Rock (Plymouth Rock), State Explorer Rock (Dighton Rock), and State Building and Monument Stone . In ...
A highly sought after variety of gem garnet is the fine green Grossular garnet from Kenya and Tanzania called tsavorite. This garnet was discovered in the 1960s in the Tsavo area of Kenya, from which the gem takes its name. Viluite is a variety name of grossular; that is not a recognized mineral species. [6]
The Hardwick and Coys Hill granites both intruded at this period and ultramafic rocks found with the Coys Hill granite may preserve the ancient oceanic crust of the Iaptetus Ocean. [ 6 ] At the core of the Bronson Hill belt is the Monson gneiss, rich in microcline , plagioclase, amphibole schist, and eye-shaped augen gneiss.
Granite (/ ˈ ɡ r æ n ɪ t / GRAN-it) is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous ...
Granite Mills are two historic cotton textile mills located on Bedford Street in Fall River, Massachusetts, consisting of Granite Mill No. 2 and Granite Mill No. 3. The site was determined eligible to be listed on the National Register of Historic Places in 1983, but was omitted due to owner's objection.
The Rollstone Boulder is a ten-foot-tall, 110-ton porphyritic granite glacial erratic located on a traffic island in downtown Fitchburg, Massachusetts. The boulder was exploded at its original location at the summit of Rollstone Hill and then reassembled near Fitchburg's Upper Common in 1929 from the pieces.
A block of granite in 2017 from the Fletcher Granite Company. 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 inches (5.1 to 12.7 mm) across and in some cases tapering out to 1 inch (25 mm) in length. [1]