RI is the difference between the speed of light in a vacuum and the speed of light in the gemstone. As light passes through a gemstone, it slows down because a gemstone is denser than air. This causes the path of light to change. Refraction is the bending of light as it passes in...
The bulk of this rock is serpentine in a massive form. There are three main serpentine minerals: antigorite, chrysotile, and lizardite. All are generally green from a significant iron content replacing the magnesium; other metals may include Al, Mn, Ni, and Zn, and silicon may be partly re...