Tumbled chert or chalcedony

Olive-gray, waxy to dull luster, opaque to slightly translucent edges, smooth rounded surface, and layered/conchoidal-looking fractures. Mohs hardness about 6.5–7; no obvious cleavage; specific gravity near 2.6.

Likely silica-rich sediment or silicified material that later recrystallized as microcrystalline quartz, then became naturally or mechanically rounded. Exact age cannot be determined from the photograph; near 30.2°N, 92.3°W, transported gravel or imported tumbled stone is more likely than locally formed chert.

Used as aggregate, road material, toolstone, and decorative/tumbled stone. Usually modest collector value.

The pale bands may reflect chalcedony growth, weathering, or thin sedimentary layering. A steel file should not scratch it, while quartz should scratch glass.

Field identification favors chert/chalcedony if it has a waxy feel, conchoidal fracture, and scratches glass. Southwestern Louisiana is dominated by young sediments and commonly contains transported river gravels rather than exposed bedrock; test streak, hardness, and inspect a fresh break for confirmation.