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Chrysolite is from the Greek chrysolithos meaning a precious stone of golden color. It comes from chryso meaning precious things made of gold, and lithos meaning of building stones. Peridot is the gemstone form of Olivine or Chrysolite and possesses a much richer green color. Mg-rich Olivine has been discovered in meteorites, on the Moon, and on Mars. Chrysolite and Olivine in general are a very abundant, but gem quality Peridot is rather rare.
The only common mineral that has properties similar to pyrite is marcasite, a dimorph of pyrite with the same chemical composition but an orthorhombic crystal structure. Marcasite does not have the same brassy yellow color of pyrite. Instead it is a pale brass color, sometimes with a slight tint of green.