This stone is from the magnesite family and is called Wild Horse Turquoise. It is NOT from the same family of stones as the bluish turquoise. Wild horse turquoise is a relatively new find from Arizona and is rapidly gaining in popularity. It is sometimes called Appaloosa or Crazy Horse Magnesite because the patterns resemble spots on a horse. This cabochon is 18x13mm and is set in a sterling silver ring, size 10. Note the darker maroon section on one end and the yellowish spot on the other end.