A meteorite is more plausible when several clues appear together: it feels unusually heavy for its size, responds to a magnet, has a thin dark outer crust or thumbprint-like marks, and shows tiny metallic flecks on an existing broken surface. None of these clues proves it came from space. Terrestrial rocks and industrial materials can mimic them, so treat home checks as screening—not a verdict. Proper identification requires an in-person examination, as the USGS explains.
What makes a rock worth checking?
Look for a combination of traits rather than one dramatic feature. Density, magnet response, exterior texture, streak, and visible interior details can help you decide whether to seek expert review, but they are not a validated scoring system and cannot confirm a meteorite at home.
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- Unusually dense for its size: Many meteorites contain iron-nickel metal or dense minerals, but density varies by meteorite type.
- Magnetic attraction: Common in meteorites containing iron-nickel metal, though not universal.
- Thin, dark outer crust or thumbprint-like depressions: These may be present on some meteorites, but weathering and breakage can obscure them.
- Tiny metallic flecks: These may appear on the existing broken or cut surface of many ordinary chondrites.
For perspective, the UCLA Meteorite Museum gives iron meteorites a density of 7.4–7.9 times that of water and says they weigh about three times as much as similarly sized Earth rocks; it describes most chondrites as about one and a half times as heavy as comparable Earth rocks. These are examples for particular types, not universal thresholds for identifying a specimen. No broadly applicable numerical cutoff is established. See the UCLA Meteorite Museum FAQ.
How to check a suspected meteorite safely
1. Compare its weight with its size
Pick it up and consider whether it feels unusually heavy compared with an ordinary rock of similar dimensions. This is only a preliminary clue: meteorites vary, and terrestrial rocks or industrial material can also be dense. Do not use a specific weight threshold as a pass-or-fail test.
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2. Try a magnet cautiously
Hold a small magnet near the specimen and note whether it attracts. Iron meteorites are strongly magnetic, and many stony meteorites respond more weakly because they contain iron-nickel metal. But some meteorites—including lunar and Martian examples and certain eucrites—are essentially metal-free. Terrestrial magnetite and other materials can also attract a magnet, so a response is not proof of a meteorite. The USGS and University of Nevada, Reno describe these limitations.
3. Inspect the outside without cleaning it aggressively
A fresh stony meteorite may have a thin, dark fusion crust formed as it passed through the atmosphere. Some meteorites also have shallow, thumbprint-like depressions called regmaglypts. Neither feature is required: weathering can turn a surface rusty brown or wear the crust away, and a fragment may not retain a complete crust or characteristic shape. A dark surface alone can also have an earthly explanation, such as desert varnish. See the Arizona State University Buseck Center’s appearance guide and the California Geological Survey.
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4. Treat streak as a limited screening test
If you have an unglazed ceramic surface, a red or black streak may point toward hematite or magnetite rather than a meteorite. But some terrestrial igneous rocks leave no streak, so the absence of one does not establish that a specimen is a meteorite. Avoid rubbing a valuable or fragile specimen; streak testing can damage it. The USGS and University of Nevada, Reno explain the test’s limits.
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If the specimen already has an exposed interior, check for tiny metallic flecks. These occur in many ordinary chondrites, but they are not conclusive. Do not cut or grind a specimen just to inspect it; preserve it for an expert to examine.
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Common lookalikes and misleading clues
| Observation | Why it is not proof |
|---|---|
| Strongly magnetic, dark rock | Terrestrial magnetite and other materials can be magnetic. |
| Heavy object for its size | Dense terrestrial rocks and industrial material can feel heavy too. |
| Dark or rusty exterior | A dark surface can result from terrestrial coatings such as desert varnish; weathered meteorites can also become rusty brown. |
| Bubbles or vesicles | These are common in terrestrial volcanic rocks and slag, not a typical meteorite feature. |
| No visible fusion crust | Weathering or fragmentation may remove or obscure the crust. |
| No streak | Some terrestrial igneous rocks leave no streak, so this result does not identify a meteorite. |
Use the observations together to decide whether the specimen merits review, not to assign it a final identity. A photo or online checklist cannot conclusively identify it. The Arizona State University Buseck Center’s identification page also cautions against relying on online tests. The USGS states: “Rocks and minerals–including potential meteorites–must be examined in person for proper identification.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to do if several clues fit
- Record the find: Note where it was found and its approximate mass and dimensions.
- Photograph it: Take clear pictures beside a ruler, including the exterior and any already exposed interior.
- Preserve its condition: Avoid rough cleaning, cutting, grinding, or other destructive tests.
- Ask a local expert: Contact a state geological survey, nearby university geology department, or natural history museum about examination.
- Check intake rules first: Ask whether the organization currently accepts specimens and how it wants them submitted before mailing or bringing anything in. Services vary by location.
The USGS does not verify meteorites. Arizona State University’s Buseck Center says its identification program was suspended in 2010, so do not assume it currently accepts identification requests. See the USGS guidance, the ASU identification page, and the Michigan Geological Survey FAQ.
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