Klerksdorp sphere

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English[edit]

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Wikipedia
A Klerksdorp sphere. It is 3 to 4 cm in maximum diameter and 2.5 cm in thickness.

Pronunciation[edit]

Noun[edit]

Klerksdorp sphere (plural Klerksdorp spheres)

  1. 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.
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