quartzite, sand and gravel, sericite, talc, soapstone, and vermic- ulite. surface is covered with thick layers of sediment which may conceal possible desirable mineral deposits. minerals found in other parts of south georgia, such as industrial sand, chert, jasper, chalcedony, industrial clays, and road fill are known to occur in this area. Mlnov 02, 2017 jasper, a form of chalcedony, is an opaque, impure variety of silica, usually red, yellow, brown or green in color. blue is rare. this mineral breaks with a smooth surface, and is used for ornamentation or as a gemstone.it can be highly polished and is used for vases, seals, and at one time for snuff boxes.when the colors are in stripes or bands, it is called striped or banded jasper.