The Micronesian island of Yap is known for its stone money, known as Rai or Fei. They use large doughnut-shaped, carved disks of calcite, some as large as 13 ft in diameter. The rai is still used today for social transactions, such as marriage, inheritance, & political deals. – WTF Fun Facts
calcite
Altamura man fossil
Altamura man is an extremely well preserved fossil of a man who fell down a well/sinkhole over 100,000 years ago. Researchers are still trying to figure out how to safely extract the remains from the calcite. – WTF Fun Facts