EntityQ1291094· pop 14· linked from 8 articlesKlerksdorp sphereSign in to savesmall mineral objects, often spherical to disc-shaped, found in pyrophyllite deposits near Ottosdal, South AfricaConnectionsNew YorkEntityyearEntityvolcanoEntityUtahEntitycarbonEntitylakeEntityInternational Standard Book NumberEntitysteelEntitysandEntityWayback MachineEntitylavaEntityquartzEntitysilicon dioxideEntityfeldsparEntityMohs scale of mineral hardnessEntitypyriteEntityhematiteEntitypebbleEntitysedimentEntityweatheringEntityCategoriesArchean geologyGeofactsGeology of South AfricaNorth West (South African province)PseudoarchaeologySpheres