
What are the mysterious “spheres” of Klerksdorp found in a mine in South Africa
A sphere of Klerksdorp. It has a diameter of 3–4 centimeters and a thickness of 2.5 centimeters. Credit: Robert Huggett, via Wikimedia Commons Found in the mines of Ottospandin South Africathe “Spheres “of Klerksdorp I am natural concretionsmainly made up of iron -based minerals, such as thehematiteabout approximately 3.2 billion years ago and today found inside Metamorphic rocks rich in ...








