61mm Golden Pyrite Egg Natural Quartz Crystal Sparkling Druzy Mineral Polished Stone Egg Fool's Gold - Peru + Plastic Stand (#2) You will receive exactly this Pyrite Egg - 61mm x 48mm / 2 7/16 x 1 7/8 Inches; 240g / 8.5 oz (see photo, the photos are taken under bright light, stand included)! Pyrite is a brass-yellow mineral with a bright metallic luster. It has a chemical composition of iron disulfide (FeS2) and is the most common sulfide mineral. It forms at high and low temperatures and occurs, usually in small quantities, in igneous, metamorphic and sedimentary rocks worldwide. Chemical Formula: FeS2; Hardness: 6 - 6.5; Color: Yellowish gray to gray. Some specimens oxidize and form a yellow-brown or iridescent film on exposed crystal faces. The name "pyrite" is after the Greek "pyr" meaning "fire." This name was given because pyrite can be used to create the sparks needed for starting a fire if it is struck against metal or another hard material. Pieces of pyrite have also been used as a spark-producing material in flintlock firearms. Pyrite has a nickname that has become famous - Fools Gold. The mineral's gold color, metallic luster and high specific gravity often cause it to be mistaken for gold by inexperienced prospectors. (The above information is provided solely for informational purpose. Kindly note that all stones are offered for decorative purposes only. Please, handle your stones with great care, do not grind or crumble them, do not dip or add them into your food or drink, do not use any parts of them in any elixirs, potions, lotions etc. Always make sure you wash your hands before and after working with your crystals.)