Magnesite 10mmWhite with a dark web like pattern throughout this gemstone. Magnesite deposits are found in Australia, Austria, Brazil, Italy, and Zimbabwe. They have also been found in meteorites and on the planet Mars! Magnesite is a very desirable mineral to mine because it is a rich source for Magnesium, an element that can only naturally occur in combination with other elements. Magnesite is used to produce Magnesium products. Magnesite can help encourage the