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Wisconsin State Rock
Adopted on March 9, 1971.
Wisconsin designated red granite its state rock on March 9, 1971 after the Kenosha Gem and Mineral Society proposed a mineral and rock be chosen to promote geological awareness.
Red granite was chosen because of its abundance, uniqueness, economic value, and historical significance. The Kenosha Gem and Mineral Society proposed the bill for the state mineral and rock.
Red Granite is mined in several sections of the state. It is an igneous rock and is composed of quartz and feldspar. It was selected because of its economic importance.
Wisconsin State Rock: Red Granite
Granite is a common and widely-occurring group of intrusive felsic igneous rocks that forms at great depths and pressures under continents. Granite consists of orthoclase, plagioclase quartz, hornblende, biotite, muscovite and minor accessories such as magnetite, garnet, zircon and apatite minerals. Rarely a pyroxene is present. Ordinary granite always carries a small amount of plagioclase, but when this is absent the rock is referred to as alkali granite. An increasing proportion of plagioclase feldspar causes granite to pass into granodiorite. A rock consisting of equal proportions of orthoclase and plagioclase plus quartz may be considered a quartz monozonite. A granite containing both muscovite and biotite micas is called a binary granite.
How to recognize red granite
The Rock - GRANITE
Granite is a light-colored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below Earth’s surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles and other minerals. This mineral composition usually gives granite a red, pink, gray or white color with dark mineral grains visible throughout the rock.
1.10 State song, state ballad, state waltz, state dance, and state symbols.
Rocks, Minerals, & Gems
State symbols represent things that are special to a particular state. Some of these symbols are the Gemstone, Minerals, Rocks. Of the 50 states, 19 have adopted a state gemstone and all have adopted some sort of earth symbol.
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