What is the chemical composition of peridot?

PHYSICAL PROPERTIES OF PERIDOT. Peridot Chemical composition: (MgFe)2SiO4; Class: nesosilicate; Crystal system: orthorhombic; 2/m2/m2/m; Crystal habit: commonly as compact or granular masses, also as loose or embedded grains, sometimes in volcanic nodules. read more

Some even refer to peridot as 'olivine', but when it comes to the gemstone, 'peridot' is the correct term. Peridot is an idiochromatic gem, meaning its color comes from the basic chemical composition of the mineral itself and not from minor traces of impurities. read more

The chemical composition of peridot is (Fe,Mg)2SiO4. Either iron or magnesium may be attached to the unit cell of peridot. This substitution of elements is alters the color of peridot, ranging from olive green to yellow and brown. read more

Olivine, of which peridot is a type, is a common mineral in mafic and ultramafic rocks, and it is often found in lavas and in peridotite xenoliths of the mantle, which lavas carry to the surface; but gem quality peridot occurs in only a fraction of these settings. read more