Klerksdorp sphere (English, noun)
expansion: Klerksdorp sphere (plural Klerksdorp spheres)
Senses:
glosses: A small object, often spherical to disc-shaped, found in three-billion-year-old pyrophyllite deposits mined near Ottosdal in South Africa, and thought to have originated as concretions in ancient accumulated volcanic sediments or ash.
Forms:
form: Klerksdorp spheres
tags: plural