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Missouri State Lithologic Emblem & Rock

Mozarkite

Missouri State Lithologic Emblem - Rock: Mozarkite

(Synonym of: Chert )

Adopted on July 21, 1967.

Mozarkite was adopted as the official state rock on July 21, 1967, by the 74th General Assembly. 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. Mozarkite is most commonly found in Benton County. (RSMo 10.045)

Missouri State Lithologic Emblem - Rock: Mozarkite

Missouri State Lithologic Emblem - Rock: Mozarkite

A myriad of visions appear to anyone hearing the word "Ozarks" - mountain folk; rough, hilly country; cool, bubbling springs; clear-flowing streams; float fishing for the wily bass; caves lined with stalactites and stalagmites; and ó to rock and mineral collectors, hobbyists, and lapidaries ó a place to hunt for MOZARKITE.

The name MOZARKITE is a contraction of "Mo" -Missouri; "zark" - Ozarks; and "ite" - meaning rock. Mozarkite is a form of chert (flint) consisting essentially of silica (SiO2) with varying amounts of chalcedony. Mozarkite 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. Typically, the colors are different hues of red, pink, and purple with varying tints of green, gray and brown. It is admired by lapidarists throughout the nation.

Interest in collecting mozarkite in Missouri started in the early 1950s, in Benton County. The majority of occurrences are in west-central Missouri, south of the Missouri River, and west of the Lake of the Ozarks. Mozarkite occurs in the Cotter Dolomite of Ordovician age, which means it is some 450 million years old. It is found in residual boulders in the soil on hillslopes, along ditches, and in roadcuts where the boulders are exposed in the soil formed by weathering of the Cotter Dolomite.

In 1967, the 74th Missouri General Assembly designated the colorful mozarkite as the official state rock.

Mozarkite is a Form of Chert (Flint).

Missouri State Lithologic Emblem - Rock: Mozarkite

Chert is a sedimentary rock of biochemical origin. It is likely the result of the accumulation (in the deep ocean, far from land) of the silica shells of various micro-organisms such as diatoms. Note that the similar rock chalk is composed of the calcite shells of different micro-organisms.

Mozarkite is a form of chert (flint). It is the state rock of Missouri. The name is a portmanteau, formed from Mo (Missouri), zark (Ozarks), and ite (meaning rock).

Missouri State Lithologic Emblem - Rock: MozarkiteMozarkite consists essentially of silica (quartz - SiO2) 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 semi-precious gemstone, and has a density of about 2.65 g/cm3. 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, Missouri. 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 Ordovician 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.

Missouri Law

The law designating the rock "mozarkite" as the official Missouri state lithologic emblem is found in the Missouri Revised Statutes, Title 2, Chapter 10, Section 10.045

TITLE II SOVEREIGNTY, JURISDICTION AND EMBLEMS
Chapter 10
State Emblems
Section 10.045

August 28, 2013
State lithologic emblem.

10.045. The rock "mozarkite" is the official rock and lithologic emblem of Missouri.

(L. 1967 p. 93 § 1)

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