Mozarkite
A variety of Chert
What is Mozarkite?
A variety of flint, mozarkite is a very compact and hard material known for its colorful swirls and patterns. Found only in the state of Missouri (USA), it was adapted as the Missouri state rock in 1967. This semi-precious stone can be finely polished so it's regularly used for cabochons and tumbled stones.
Etymology & Origins
The name is a portmanteau, formed from Mo (Missouri), zark (Ozarks), and ite (meaning rock).
Uses & Applications
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.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Mozarkite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Where to Find Mozarkite
Mozarkite is a variety of Chert. RockHoundR, the free-to-download rockhounding map from the Ruby Glint team, shows where collectors find chert in the US, with land-access notes for BLM land and national forests. Collecting is banned in national parks.
See where to find chertAlways check the local rules and get the landowner's permission before you collect.
Quick Facts
Physical Properties
- Color
- Gray, white; black, brown and other colors due to staining
- Hardness (Mohs)
- 6.5 - 7
- Rock tumbling
- Tumbles well
- Density
- 2.65 g/cm³
- Streak
- White or lightly colored
Chemical Properties
- Chemical Formula
- SiO2
Also Known As
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Mozarkite FAQs
How do I identify Mozarkite?
Mozarkite can be identified by its hardness of 6.5 - 7 on the Mohs scale, Gray color. Look for these key characteristics when examining specimens.
What color is Mozarkite?
Mozarkite typically appears in Gray, white; black, brown and other colors due to staining. Color can vary depending on impurities and formation conditions.
How hard is Mozarkite?
Mozarkite has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.
