Klerksdorp sphere
English
A Klerksdorp sphere. It is 3 to 4 cm in maximum diameter and 2.5 cm in thickness.
Noun
Klerksdorp sphere (plural Klerksdorp spheres)
- A small object, often spherical to disc-shaped, found in three-billion-year-old pyrophyllite deposits mined near Ottosdal in South Africa.