Klerksdorp spheres are small objects, often spherical to disc-shaped, that have been collected by miners and rockhounds from 3-billion-year-old pyrophyllite deposits.

Klerksdorp spheres are small objects, often spherical to disc-shaped, that have been collected by miners and rockhounds from 3-billion-year-old pyrophyllite deposits. They have been cited by alternative researchers and reporters in books, popular articles, and many web pages, as inexplicable out-of-place artifacts that could only have been manufactured by intelligent beings.

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