How Can You Tell if a Meteorite Is Real?
Meteorite Identification
Real meteorites are usually dense, attract a magnet due to iron-nickel metal, often have a dark fusion crust from atmospheric entry, and may show metal grains or chondrules when cut. Confirming a meteorite with certainty, however, requires laboratory testing and scientific classification.
Written by Brian McDonald, IMCA #3323, Treasure Coast Meteorite Co.
Why Meteorite Identification Is Difficult
Every year thousands of people believe they have found a meteorite. In reality, the vast majority turn out to be ordinary Earth materials such as iron ore, industrial slag, or magnetite. These are commonly called meteorwrongs.
The problem is not just that terrestrial rocks can look similar to meteorites. It is that meteorites themselves are incredibly varied. An iron meteorite looks nothing like a carbonaceous chondrite. A lunar meteorite looks nothing like a pallasite. There is no single appearance that defines a meteorite, which makes identification genuinely challenging even for experienced collectors.
What identification really comes down to is a combination of physical clues, an understanding of what meteorites are made of, and when necessary, laboratory analysis.
Common Signs of a Real Meteorite
Magnetic Attraction
Most meteorites contain iron-nickel metal in some form, which means they will usually attract a magnet. Even many stony meteorites contain small metal grains distributed throughout the matrix that respond noticeably to a strong rare-earth magnet.
A weak response does not rule out a meteorite, and a strong response does not confirm one. Magnetite and some industrial materials are also strongly magnetic. The magnet test is a useful first screen, not a final answer.
High Density
Meteorites are typically heavier than ordinary rocks of similar size because of their metal content. Many meteorites feel noticeably dense when picked up, and this is one of the simplest and most reliable informal tests available to someone with no equipment.
Stony meteorites generally have a specific gravity between 3.0 and 3.8. Irons can exceed 7.5. Most common terrestrial rocks fall between 2.5 and 3.0.
Fusion Crust
When a meteoroid enters Earth's atmosphere at high speed, the outer surface melts and solidifies into a thin glassy shell called fusion crust. It is usually dark brown to black and may appear smooth, matte, or slightly glossy depending on the meteorite type and entry conditions. On older finds, weathering can bleach, chip, or entirely remove it.
Fusion crust on a freshly recovered meteorite. The dark glassy coating forms during atmospheric entry.
Regmaglypts
Some meteorites display shallow thumbprint-like depressions called regmaglypts. These form as material ablates from the surface during atmospheric flight, sculpted by aerodynamic forces. They are most pronounced on oriented meteorites that maintained a stable flight orientation.
NWA 17296 L5 chondrite, 1,472.00g, showing well-developed regmaglypts on an oriented individual.
Metal Grains
When cut or polished, many meteorites reveal tiny flakes or blebs of shiny iron-nickel metal embedded in the stone. These are clearly metallic under good lighting and are essentially absent in most terrestrial rocks. Seeing metal grains in a fresh cut section is one of the strongest visual indicators available without lab equipment.
Iron-nickel metal blebs visible in a polished cut window. These metallic inclusions are diagnostic of a chondritic meteorite.
Chondrules
Many stony meteorites called chondrites contain small round structures known as chondrules, silicate spherules that formed as molten or partially molten droplets in the early solar system before planets existed. They are among the oldest solid materials ever studied.
Chondrules are not found in terrestrial rocks. Their presence in a cut section is a strong indicator of a chondritic meteorite, though not all chondrites display them prominently.
NWA 16975 LL3 chondrite showing armored chondrules in cross-section. Chondrules are absent in all terrestrial rocks.
Widmanstätten Pattern
Iron meteorites that have been cut, polished, and acid-etched often reveal a distinctive interlocking crystal structure called the Widmanstätten pattern. This crystalline banding forms over millions of years of slow cooling deep inside a planetary body and cannot be replicated artificially. It is one of the most definitive visual confirmations possible for an iron meteorite.
Muonionalusta IVA octahedrite, 245.82g. The fine-scale Widmanstätten lamellae are characteristic of this group's slow cooling rate deep within an asteroid core.
No Quartz, No Vesicles
Two features that strongly argue against a meteorite are quartz and gas bubbles. Quartz is extremely common in Earth rocks but essentially absent in meteorites. Gas vesicles, the small rounded holes seen in volcanic basalt and lava, are also essentially absent in genuine meteorites. A rock with abundant holes or visible quartz is almost certainly terrestrial.
Simple Tests You Can Do at Home
Magnet Test
Hold a strong rare-earth magnet near the rock. Most meteorites will attract it noticeably due to iron-nickel metal content. A weak kitchen magnet may not be sensitive enough to detect a response in stony meteorites with low metal content.
Streak Test
Rub the rock firmly on the back of an unglazed ceramic tile. Many iron-bearing Earth minerals leave a colored streak, typically red, brown, or black. Meteorites usually leave little to no streak, or a faint gray metallic streak.
The streak test requires only an unglazed ceramic tile. A genuine meteorite typically leaves little to no visible streak.
Density Test
Density is one of the most useful informal tests because it requires only a kitchen scale and a container of water, and it produces a number you can compare against known values. Weigh the rock dry in grams, then submerge it fully in water and measure the volume of water displaced in milliliters. Dividing the dry weight by the displaced volume gives you specific gravity.
| Material | Specific Gravity |
|---|---|
| Common terrestrial rocks (granite, limestone) | 2.5 to 3.0 |
| Stony meteorites | 3.0 to 3.8 |
| Stony-iron meteorites | 4.5 to 5.5 |
| Iron meteorites | 7.0 to 8.0 |
A result above 3.5 in a rock with no obvious quartz or vesicles is worth investigating further. Some terrestrial iron ores and industrial materials can reach similar values, so density alone is not diagnostic. A rock that simply feels surprisingly heavy for its size is always worth a closer look.
Cut Window Test
Grinding or cutting a small flat area into the rock can reveal what is inside. Metal grains, chondrules, or unusual mineral textures that appear in cross-section are far more diagnostic than the exterior surface alone. This is often the most informative test a collector can do without sending a sample to a lab.
NWA 17298 L6 ordinary chondrite, 209.51g. The polished cut window reveals shock veins and the fine-grained chondritic interior.
Common Meteorwrongs
Most rocks mistaken for meteorites fall into a few recurring categories. Knowing what these look like can save considerable time and uncertainty.
How Scientists Confirm Meteorites
Home tests can raise or lower suspicion, but definitive identification requires laboratory analysis. Scientists examine suspected meteorites using several techniques.
Once confirmed and classified, meteorites are officially documented in the Meteoritical Bulletin, the international registry for classified meteorites.
Getting a Suspected Meteorite Examined
If you believe you have found a meteorite, the most practical first step is to submit photographs and measurements to an experienced identifier before committing to physical sampling or shipping. Several university geology departments and natural history museums accept meteorite inquiries. The Meteoritical Society maintains a list of researchers and institutions involved in classification work.
Be aware that most classification labs charge fees and require sample material. If multiple home tests support your suspicion, the process is worth pursuing.
We have handled thousands of meteorites and are glad to offer a second opinion. Feel free to reach out through our contact page if you have a candidate you would like us to review.
Why Meteorites Are So Rare
Although thousands of meteoroids enter Earth's atmosphere every year, the vast majority burn up entirely or land in oceans, forests, or remote regions and are never recovered. Of those that do reach the ground, only a small fraction are ever found. Of those found, only a fraction are eventually classified.
The number of officially documented meteorites in the Meteoritical Bulletin represents centuries of accumulated finds from collectors, scientists, and recovery expeditions in places like the Sahara, the Atacama, and Antarctica, where dark stones against light surfaces make searching practical.
Learn More About Meteorites
Browse Authentic Meteorites
Frequently Asked Questions
Do meteorites stick strongly to magnets?
Most meteorites respond to a strong rare-earth magnet due to iron-nickel metal content. The strength of the response varies by type. Iron meteorites respond very strongly. Some stony meteorites with low metal content may show only a mild response.
Are meteorites radioactive?
Meteorites contain only trace levels of natural radioactivity, comparable to many common rocks. They are safe to handle and collect.
Do meteorites contain bubbles?
Almost never. Gas vesicles are a strong indicator of volcanic rock or industrial slag, not a meteorite.
Are meteorites always black?
No. Fresh meteorites often have a dark fusion crust, but weathered specimens can appear brown, gray, or even rust-colored depending on how long they have been on the surface.
Can a rock be a meteorite if it does not attract a magnet?
Rarely, but yes. Some meteorites, particularly certain carbonaceous chondrites and achondrites, have very low metal content and may show little or no magnetic response. This makes them much harder to identify without laboratory analysis.
Where can you buy a real meteorite?
Authentic meteorites are available from reputable dealers and collectors, many of whom are members of the International Meteorite Collectors Association. Treasure Coast Meteorite Co. offers authenticated specimens with honest documentation and a physical Certificate of Authenticity with every purchase.
