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).

Mozarkite 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.

State Rock



  • Missouri Department of Natural Resources, Geological Survey and Resource Assessment Division fact sheet number 23; PUB 000653; 6/2002

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • mozarkite — noun A particular kind of rock, a form of chert, native to Missouri. Syn: ozarkite …   Wiktionary

  • ozarkite — noun a) A type of rock (hydrous aluminum silicate) that is native to the Arkansas; also called thomsonite. b) The mineral mozarkite of the Missouri, Ozark region. Syn …   Wiktionary

  • Agate — For other uses, see Agate (disambiguation). Agate Banded agate (agate like onyx); the specimen is 2.5 cm (1 inch) wide General Category …   Wikipedia

  • Missouri — This article is about the U.S. state of Missouri. For the river, see Missouri River. For other uses, see Missouri (disambiguation). State of Missouri …   Wikipedia

  • Menilite — is a greyish brown form of the mineraloid opal.[1] It is also known as liver opal or leberopal (German), due to its color. It is called menilite because it was first described from Ménilmontant (Paris) …   Wikipedia

  • Quartz — This article is about the mineral. For other uses, see Quartz (disambiguation). Quartz Quartz crystal cluster from Tibet General Category …   Wikipedia

  • Silicon dioxide — Silica redirects here. For other uses, see Silica (disambiguation). Silicon dioxide …   Wikipedia

  • Chalcedony — A cut and polished Chalcedony geode General Category Oxide mineral Chemical formula …   Wikipedia

  • Carnelian — For other uses, see Carnelian (disambiguation). Cornelian redirects here. For other uses, see Cornelian (disambiguation). Sard redirects here. For other uses, see Sard (disambiguation). Carnelian / Sard Polishe …   Wikipedia

  • Opal — For other uses, see Opal (disambiguation). Opal An opal bracelet. The stone size is 18 by 15 mm (0.7 by 0.6 in) General Category …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.