411 REFERENCE · Wiktionary
Klerksdorp sphere
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
thumb|A Klerksdorp sphere. It is 3 to 4 cm in maximum diameter and 2.5 cm in thickness.
Pronunciation
en ɪə(ɹ) 3
Noun
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.