Rare meteorite turned up in farmer’s field

That strange rock you come across might be from outer space : Farmers’ Rock Turns Out to Be Rare Meteorite | Arlington, Minn. Meteorite – Space.com

On May 30, the couple brought their find to Alexander’s lab and allowed him to chip 0.02 ounces (0.6 grams) off the edge of it for analysis under a scanning electron microscope. The rock was iron, and contained about 8 percent nickel — a telltale giveaway. Iron objects on Earth contain almost no nickel, but iron rocks from space are usually between 5 and 20 percent nickel. The microscope also revealed what’s called a Widmanstätten pattern of nickel-iron crystals that’s unique to meteorites