Meteorite or Meteorwrong? The Rocks That Fool Everyone
Meteorite dealers see the same handful of look-alikes over and over. Learn to recognize them and you can settle most finds in minutes, and know when a rock deserves a closer look.
Seven materials account for most mistaken finds: hematite, magnetite, slag, industrial iron, lava rock, pyrite, and dark weathered stones. Each one has a specific tell, and one quick test usually settles it. A red streak, gas bubbles, quartz, layering, or glittery surface crystals all point to an Earth rock. A rock that clears every rule-out and shows several positive signs together is a candidate worth screening, and only a laboratory can confirm one.
Add a photo and the optional analysis names the specific features it sees for and against your rock, including the disqualifiers covered on this page.
Meteorwrong is the word dealers and collectors use for a rock that looks like a meteorite but is not one. It is not an insult. Some meteorwrongs are convincing enough to fool experienced eyes at arm's length, which is exactly why the checks below focus on features you can test rather than looks alone.
Here are the look-alikes we see most, why each one fools people, and the test that settles it.
The seven usual suspects
01 Hematite
An iron oxide mineral and the single most common meteorwrong. It is heavy for its size, often dark gray to steel colored, sometimes with a rounded kidney-ore surface, and it can respond weakly to a magnet. On heft and color alone it checks a lot of boxes.
The test that settles it takes seconds. Drag the rock across an unglazed white ceramic surface, like the underside of a toilet tank lid or the bare foot ring on a mug.
02 Magnetite
Another iron oxide, and the one that fools people with the magnet test. Magnetite is strongly magnetic, dense, and black. It can even occur as smooth rounded pebbles that look ancient and otherworldly.
Look for what it lacks and what it has. Magnetite has no fusion crust, no interior metal flecks, and often shows small octahedral crystal faces. It typically leaves a black streak. A black or dark gray streak is a strong sign of an Earth rock, though unlike a red streak it is not an absolute rule-out on its own, because a small number of genuine meteorite types can also leave a dark streak.
03 Slag
Waste from metal smelting, and the most convincing meteorwrong at first glance. Slag is dark, heavy, often magnetic, and genuinely melted, so it can carry a glassy, flowed surface that looks like it fell from the sky. It turns up along old railways, industrial sites, and fill dirt far from any furnace.
The giveaway is bubbles. Slag melts in open air, so trapped gas leaves rounded holes and a spongy interior. Space has no atmosphere, so meteorites do not form gas bubbles. Fusion crust is a thin rind over solid rock, not a bubbly melted mass.
04 Industrial iron
Grinding balls, counterweights, cannonball-shaped mill media, plow points, and rusted machine parts all get found in fields and mistaken for iron meteorites. They are metallic, dense, and strongly magnetic, exactly like the real thing.
Chemistry settles this one. Meteoritic iron always contains nickel, and most man-made iron and steel does not. A nickel test or an XRF reading on metallic material is decisive: metal with no nickel is man-made. Regular shapes, flat faces, and machining marks are supporting clues.
05 Basalt and other lava rock
Dark, dense-looking volcanic rock is everywhere, and a water-worn piece of basalt can look impressively meteorite-like. Some basalt is even weakly magnetic because it contains magnetite grains.
Check the surface and the pores. Lava rock commonly carries vesicles, the same gas bubbles that expose slag, and it has no true fusion crust and no bright metal flecks inside. A dark weathered exterior that is the same material all the way through is a weathering rind, not crust.
06 Pyrite, the original fool's gold
Pyrite fools people in the other direction: it looks too spectacular to be ordinary. Brassy metallic glitter, sharp cubic crystals, real heft. Surely something that striking came from space.
It did not. Meteorites do not carry a glittery crystal coating on their exterior. Sparkly surface crystals point to Earth minerals like pyrite, mica, or quartz, and pyrite's sharp cubes are a definitive terrestrial signature.
07 Dark weathered stones
River cobbles and desert stones can develop a smooth, dark, almost polished coating over centuries. That patina mimics fusion crust well enough to fool a photo, and a dense rounded cobble has convincing heft.
The interior tells the truth. Chip or cut a small window and a patinated cobble shows ordinary rock inside, often with visible quartz grains, and no metal flecks. Real fusion crust sits over a distinctly different interior, typically gray and fine grained in stony meteorites, often with scattered bright metal.
Side by side
| Feature | Meteorite | Meteorwrong |
|---|---|---|
| Streak | Usually little to none | Red means hematite, ruled out. Black is a strong negative |
| Surface | Thin dark crust, sometimes shallow thumbprints | Bubbly melt, glitter, or a patina identical to the interior |
| Interior | Gray, fine grained, often metal flecks or chondrules | Bubbles, quartz, banding, or large crystals |
| Magnet | Most respond to a ceramic magnet | Magnetite, hematite, and man-made iron respond too |
| Metal chemistry | Meteoritic iron always contains nickel | Man-made iron and steel usually has none |
Notice that the magnet row does not separate the two. That is the trap. Magnetism narrows the field but never decides it, which is why a screening weighs several checks together instead of leaning on any one.
Which one is yours?
The free Meteorite Check screening runs these rule-outs and the positive checks in order and gives an honest read in a couple of minutes.
Put a second set of eyes on it
The look-alikes on this page are exactly what the optional photo analysis is built to catch. It reads your photos for the specific disqualifiers, gas bubbles, quartz, layering, surface glitter, and the specific positives, a true fusion crust, metal flecks, chondrules on a cut face, then explains which ones it found on your rock.
It adds detail to the free screening and explains your result. It cannot turn a look-alike into a meteorite, and only a laboratory can confirm a real one.
Add a photo in the app. From $1.99. No subscription required.
When it is not a meteorwrong
Every so often a rock clears all of this. No red streak, no bubbles, no quartz, no layering, no glitter, and instead a thin dark crust, real heft, a magnet response, and a gray interior with bright metal flecks. That combination is hard to explain with common terrestrial material, and it deserves action.
Action means a laboratory, because visual checks flag candidates and cannot confirm them. A meteorite is officially recognized once it has been classified and published in the Meteoritical Bulletin Database, the record kept by the Meteoritical Society. Our guide on what to do with a possible meteorite covers the path from screening to testing.
And if you want to train your eye on the real thing, Treasure Coast Meteorite Co. carries authentic specimens, both classified meteorites with published references and verified unclassified material. You can go deeper on identification or browse the collection.
Common questions
- What is a meteorwrong?
- A rock or material that looks like a meteorite but is not one. The most common meteorwrongs are hematite, magnetite, slag, industrial iron, lava rock, pyrite, and dark weathered stones.
- My rock is magnetic. Why is it not a meteorite?
- Magnetism narrows the field but never decides it. Magnetite, hematite, some basalt, and man-made iron all respond to a magnet. A candidate has to clear the rule-outs, like the streak test, and show several positive signs together.
- What does a black streak mean?
- A black or dark gray streak is a strong sign of an Earth mineral such as magnetite. Unlike a red streak, it is not an absolute rule-out on its own, because a small number of genuine meteorite types can leave a dark streak. Weigh it alongside the other checks.
- My rock looks melted. Is that fusion crust?
- Fusion crust is a thin dark rind, about a millimeter, over a different colored interior. A bubbly, flowed, melted-through appearance points to slag. Gas bubbles rule a rock out, since meteorites do not form them.
- How do I know for sure what I have?
- Only a laboratory can confirm a meteorite. A screening can rule out the look-alikes on this page and flag a genuine candidate, and a confirmed, classified meteorite is published in the Meteoritical Bulletin Database.