Mozarkite was adopted by the Missouri State Legislature as the official state rock on July 21, 1967. At the same time Galena was named the State's official mineral, the same material that Wisconsin selected. An attractive rock, Mozarkite appears in a variety of colors, most predominantly green, red or purple. The rock's beauty is enhanced by cutting and polishing into ornamental shapes for jewelry.
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Mozarkite is most commonly found in Benton County. Mozarkite is a form of Chert. The name is a contraction of Mo (Missouri), 
zark (Ozarks), and ite (meaning rock). Mozarkite consists essentially of silica with varying amounts of Chalcedony. It has won distinction as a particular form or variety of Chert because of its unique variation of colors and its ability to take a high polish. It has the hardness of 7-7.5 on the Mohs scale, which qualifies it as a suitable material for a semi-precious gemstone, Typically, the colors are different hues of red, pink, and purple with varying tints of green, gray and brown. It is collected and admired by lapidarists across the country.
zark (Ozarks), and ite (meaning rock). Mozarkite consists essentially of silica with varying amounts of Chalcedony. It has won distinction as a particular form or variety of Chert because of its unique variation of colors and its ability to take a high polish. It has the hardness of 7-7.5 on the Mohs scale, which qualifies it as a suitable material for a semi-precious gemstone, Typically, the colors are different hues of red, pink, and purple with varying tints of green, gray and brown. It is collected and admired by lapidarists across the country..
Interest in collecting Mozarkite in Missouri started in the early 1950s, in Benton County. It is found primarily in west-central Missouri, south of the Missouri River, and west of the Lake of the Ozarks. Mozarkite occurs in the Cotter Dolomite of Ordovivian age, which means it is some 450 million years old. It is found in residual boulders in the soil on hill slopes, along ditches, and in roadcuts where the boulders are exposed in the soil formed by weathering of the Cotter Dolomite.
Interest in collecting Mozarkite in Missouri started in the early 1950s, in Benton County. It is found primarily in west-central Missouri, south of the Missouri River, and west of the Lake of the Ozarks. Mozarkite occurs in the Cotter Dolomite of Ordovivian age, which means it is some 450 million years old. It is found in residual boulders in the soil on hill slopes, along ditches, and in roadcuts where the boulders are exposed in the soil formed by weathering of the Cotter Dolomite.
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