Is a Magnesium Silicate with formula MgSiO3.Occur in various colors, such as brown, yellow and rarely green when Chromium is present. Essentially is a collector stone, not easy to cut. It is found mainly in Sry Lanka and Tanzania as gem quality. As a mineral has been discovered also in iron meteorites. The hardness is 5-6.
This gem here is from Tanzania and is eye clean.