Peridot (/ˈpɛrɨdɒt/ or /ˈpɛrɨd/) is gem-quality olivine. Olivine is a silicate mineral with the formula of (Mg, Fe)2SiO4. As peridot is the magnesium-rich variety (forsterite) the formula approaches Mg2SiO4.

"I wanted very much to learn to draw, for a reason that I kept to myself: I wanted to convey an emotion I have about the beauty of the world."
Richard Feynman
0 online