Wisconsin State Rock - Red Granite was designated the state rock in 1971 by Wisconsin Laws, Chapter 14. The speckled igneous rock is composed of quartz and feldspar. The proposal was introduced at the request of the Kenosha Gem and Mineral Society to promote geological awareness. Red granite is an igneous rock composed of quartz and feldspar. It is mined in several sections of the state and was selected as the state rock because of its economic importance.
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