How is a peridot made out of?

Answer 1

Peridot is a gem-quality variety of the mineral olivine, composed primarily of the silicate minerals forsterite (Mg2SiO4) and fayalite (Fe2SiO4). It forms in the Earth's mantle under high-temperature and high-pressure conditions, often associated with volcanic activity. The gem is typically found in volcanic rocks, particularly basalt, and can also be sourced from meteorites. Its distinctive green color comes from the presence of iron within its crystal structure.