A possible meteorite is more convincing when several clues occur together: it feels unusually dense for its size, attracts a magnet, has a thin dark fusion crust or thumbprint-like depressions, and shows tiny metallic flecks on an existing broken surface. None of these clues proves it is a meteorite. Ordinary rocks and industrial materials can share them, while weathering or breakage can hide them. Confirmation requires an in-person examination.
Check the clues together—not as a pass-or-fail test
Use the observations below to decide whether a specimen is worth asking an expert to examine. They are screening clues, not a validated scoring system or a way to identify a meteorite conclusively. The USGS guidance emphasizes that potential meteorites must be examined in person for proper identification.
| What to check | What may support a meteorite identification | Important limitation |
|---|---|---|
| Weight relative to size | The specimen feels unusually dense compared with an ordinary rock of similar size. | Density varies by meteorite type, and heavy terrestrial or industrial material can mislead. There is no universal density cutoff for identifying an unknown meteorite. |
| Magnet response | A magnet attracts the specimen; iron meteorites are strongly magnetic, while many stony meteorites respond more weakly. | Some meteorites have little or no metal and may not respond noticeably. Terrestrial magnetite and other materials can also be magnetic. |
| Exterior | A fresh stony meteorite may have a thin, dark fusion crust; some specimens have shallow, thumbprint-like depressions called regmaglypts. | Weathering can rust or wear away the crust, and a fragment may not retain a complete exterior. Dark terrestrial surfaces can look similar. |
| Streak and texture | A specimen without bubbles or vesicles is more consistent with a meteorite than many volcanic rocks or slags. | Bubbles are a warning sign, not a definitive exclusion. A red or black streak may point to hematite or magnetite, but no streak does not prove meteorite origin. |
| Existing broken or cut surface | Tiny metallic flecks can appear in many ordinary chondrites. | Do not cut or grind a specimen just to look for flecks; the feature is not conclusive by itself. |
How to make safe preliminary observations
1. Compare size and weight
Estimate the specimen’s dimensions and mass, then consider whether it feels unusually heavy for its size. Meteorites can be dense because many contain iron-nickel metal and dense minerals, but weight alone cannot distinguish them from terrestrial rocks or industrial material. The UCLA Meteorite Museum gives type-specific examples: iron meteorites are about 7.4–7.9 times as dense as water and may weigh about three times as much as similarly sized Earth rocks; most chondrites are about one and a half times as heavy as comparable Earth rocks. These are examples, not identification thresholds.
2. Try a magnet gently
Hold a small magnet near the specimen and note whether it is attracted. A strong response is common in iron meteorites, and a weaker response occurs in many stony meteorites. But magnetism is not universal: some meteorites, including lunar and martian examples and certain eucrites, are essentially metal-free. Magnetite and other Earth materials can also attract a magnet, so this test only adds context.
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3. Examine the exterior without cleaning it
Look for a thin dark fusion crust and any shallow, thumbprint-like regmaglypts. A fresh stony meteorite may have a crust formed during its passage through the atmosphere. Exposure on Earth can turn it rusty brown or wear the crust away; a broken fragment may show little or none of the original exterior. A dark surface alone is not distinctive, since terrestrial rock can have a dark coating such as desert varnish.
4. Treat streak and bubbles as limited clues
If you already have an unglazed ceramic surface, a gentle streak check may help screen for some lookalikes: a red or black streak can suggest hematite or magnetite. However, some terrestrial igneous rocks leave no streak, so a blank result is not evidence of a meteorite. Avoid this test if it could damage a valuable or fragile specimen. Vesicles—bubble-like holes—are common in volcanic rock and slag and are not typical of meteorites, but no single surface feature settles the question.
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5. Inspect an existing exposed interior
If the specimen is already broken or cut, look for tiny metallic flecks. Many ordinary chondrites show them, but their presence is not proof. Do not create a fresh surface by cutting, grinding, or breaking the find solely for a home test.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why home tests cannot confirm a meteorite
Each screening clue has exceptions and terrestrial lookalikes. A black magnetic rock could be magnetite; a heavy object could be industrial material; and a specimen without an obvious crust could be a weathered or fragmentary meteorite. Photographs and online checklists cannot conclusively identify a specimen. As the USGS states: “Rocks and minerals–including potential meteorites–must be examined in person for proper identification.”
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Preserve the find and seek an in-person examination
- Record the find location. Note where you found it and, if possible, the circumstances in which it was exposed. Keep those details with the specimen.
- Document its condition. Record approximate mass and dimensions, and take clear photographs beside a ruler. Avoid rough cleaning or destructive tests.
- Contact a local geology resource. Ask a state geological survey, university geology department, or natural history museum whether it examines possible meteorites.
- Check intake rules first. Policies differ: confirm whether the organization accepts walk-ins, photographs, or mailed specimens before visiting or sending anything. The USGS does not verify meteorites, and Arizona State University’s Buseck Center page says its identification program was suspended in 2010.
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