They were collected from the plains of South Datoka near the Black Hills and they were so water and wind worn that they look like hardened bubble gums, hence their trade name. They apparently consist of a mix of quartz, agate, jasper and calcite. The colors are earthy (tan, orange, yellow and white). Some can be mistakened as Fairburn Agates but the bubble-gum appearance distinguish them from the fairburn agates.