Klerksdorp sphere
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English
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Ottosdal1.jpg/220px-Ottosdal1.jpg)
Pronunciation
[edit]- Rhymes: -ɪə(ɹ)
Noun
[edit]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, and thought to have originated as concretions in ancient accumulated volcanic sediments or ash.