Meteorites are solid pieces of rock that are usually densely packed with metal. If the rock you’ve found looks like a meteorite, compare it to other rocks to ensure it’s relatively heavy, then calculate its density to determine if it’s a meteorite. You can calculate the density of the potential meteorite by dividing its weight by its volume. If a rock has a calculated density higher than 3 units, it is much more likely to be a meteorite. Nearly all meteorites are at least somewhat magnetic, even if only weakly. This is due to the high concentration in most meteorites of iron and nickel, which are magnetic. If a magnet is not attracted to your rock, it’s almost certainly not a meteorite.  Because many terrestrial rocks are also magnetic, the magnet test will not definitively prove your rock is a meteorite. However, failing to pass the magnet test is a very strong indication that your rock is probably not a meteorite. An iron meteorite will be much more magnetic than a stone meteorite and many will be strong enough to interfere with a compass held close to it. A streak test is a good way to test your rock to rule out terrestrial materials. Scrape your rock against the unglazed side of a ceramic tile; if it leaves any streak other than a weak grayish one, it is not a meteorite.  For an unglazed ceramic tile, you can use the unfinished bottom of a bathroom or kitchen tile, the unglazed bottom of a ceramic coffee mug, or the inside of a toilet tank cover.  Hematite and magnetite rocks are commonly mistaken for meteorites. Hematite rocks leave a red streak, while magnetite rocks leave a dark gray streak, indicating that they are not meteorites.  Keep in mind that many terrestrial rocks also do not leave streaks; thus, while the streak test can rule out hematite and magnetite, it will not definitively prove your rock is a meteorite on its own. Most meteorites contain metal that is visibly shiny under the surface of the fusion crust. Use a diamond file to file a corner of the rock and check the interior for telltale...

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