Found a Strange Rock? Here's How to Tell If It's a Meteorite

Every year, people bring geologists chunks of black, heavy rock convinced they have found something from space. Almost none of them have. The culprits are almost always terrestrial: magnetite nodules, slag from old smelters, hematite concretions, and basalt, all of which are dark, sometimes heavy, and occasionally magnetic. The confusion is understandable. A real meteorite looks nothing like the glassy space-rock of science fiction. It looks like a rock. The difference is in the details, and the details are testable.

Start with a magnet. Most meteorites contain iron-nickel metal, and a strong rare-earth magnet, the kind inside a hard drive, will pull toward a real meteorite even through a plastic bag. A fridge magnet is too weak; borrow or buy a neodymium magnet. If there is no attraction at all, the sample is almost certainly not a meteorite, though a small class of stony meteorites called achondrites are weakly magnetic and this test alone cannot rule them out.


Next, look at the surface. A meteorite that fell recently will have a fusion crust: a thin, dark, matte-black or brownish rind formed when the outer millimetres of rock melted and resolidified during atmospheric entry. It looks like someone dipped the rock in dull black paint. It is not glassy or shiny. If the crust is chipped, the interior should be lighter, grey, tan, or speckled with tiny metallic flecks called chondrules, which are among the oldest solid objects in the solar system.


Run the rock across a piece of unglazed white ceramic tile, the back of a bathroom tile works. A meteorite leaves no streak, or a faint grey-silver one. Magnetite and hematite, two common imposters, leave a black or red-brown streak. If the streak is strong and coloured, the sample is terrestrial.


Weigh it in your hand relative to its size. Meteorites are dense. A stony meteorite runs roughly 3 to 3.5 grams per cubic centimetre; iron meteorites reach 7 to 8. If a fist-sized rock feels lighter than a similar-sized piece of concrete, it is not a meteorite.

Finally, look for regmaglypts: shallow thumbprint-like depressions on the surface, formed as the molten outer layer was pushed and sculpted by airflow during descent. Not every meteorite has them, but their presence is a strong indicator.

Holes or vesicles, the bubbly texture of volcanic basalt, mean the rock formed underground with trapped gas. Meteorites do not have this structure. A layered or foliated texture means sedimentary or metamorphic origin: Earth. Quartz is absent from all known meteorite types; if you can scratch a glassy grain with a knife and it resists, that is quartz, and the sample is terrestrial. Rust is complicated: old meteorites do weather and oxidise, but uniform, deep rust throughout a sample suggests iron ore, not a meteorite.

Do not cut, grind, or acid-test the sample yourself. Every modification reduces its scientific and monetary value. Photograph it from multiple angles against a plain background, next to a ruler. Note exactly where you found it, GPS coordinates if possible, or a precise description of the location. The find site matters for classification.

In India, the first point of contact is the Physical Research Laboratory in Ahmedabad, which houses the country's primary meteorite collection and has classified Indian finds including the Mukundpura carbonaceous chondrite that fell in Rajasthan. The Geological Survey of India also accepts samples for analysis. Internationally, the Meteoritical Society maintains the Meteoritical Bulletin Database, a public record of every officially classified meteorite; checking it against your find location can reveal whether a fall was already recorded nearby.

A confirmed meteorite found in India is subject to the Antiquities and Art Treasures Act, which restricts private sale of objects of scientific significance. Get clarity on ownership before approaching any buyer.

If a laboratory confirms the find, the sample receives an official name, usually the nearest named place followed by a number, and enters the global record. A portion is typically requested for the reference collection. What remains with the finder depends on negotiation and, in India, on regulatory guidance at the time.

The odds of any given rock being a meteorite are low. But roughly 17 meteorites are recovered globally each year outside of the systematic Antarctic search programmes, and most of them were found by someone who noticed something slightly wrong about a rock they picked up. The tests above are the same ones a curator would run first. They take ten minutes and cost nothing except a neodymium magnet.