One is known as jadeite and it is celebrated for its coloration ... In fact, when it comes to toughness, nephrite jade is the toughest known natural mineral, tougher even than ceramics and steel.

For example, jadeite is the hardest natural mineral, and painite is the second-rarest mineral in the world. The rarest mineral in the world is kyawthuite (Photo: mindat) Cost of kyawthuite The ...