Mozarkite

The name is a portmanteau, formed from Mo (Missouri), zark (Ozarks), and ite (meaning rock).

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.

Mozarkite occurs in the Cotter Dolomite of Ordovician age, which means it is some 450 million years old.