Posts Tagged Fayalite

  • August Birthstones August Birthstones

    By Eloise Graham The most popular birthstone for August, peridot (pronounced pair- a – doe,) is a gem primarily made up of two minerals: fayalite and forsterite. Fayalite has a high iron content and forsterite a high magnesium content. It is the iron that gives the stone its greenish hue. ...