How to Identify a Meteorite: the 60-Second Field Test
Real meteorites feel too heavy for their size, pull on a strong magnet held near them, leave little to no streak on unglazed ceramic, and wear a thin black fusion crust — never bubbles. Testing labs see about 7,000 hopeful rocks a year; one or two are real. This test catches the impostors in about a minute.
Never touch the magnet to a suspected meteorite: direct contact erases the magnetic record scientists study. Dangle it on a string nearby instead.
Meteorite vs. the great impostors
Nearly every “meteorite” brought to a lab is one of three earthly rocks. Here's how each one fools people — and the one tell that gives it away.
Dark, heavy, often magnetic, and it turns up miles from any obvious source — old smelters, furnaces, and railroads scattered it everywhere.
The tell: Bubbles, holes, or a glassy froth. Meteorites are compressed solid in space — they never come out foamy.
Dense, gray-black, often kidney-shaped and satisfyingly heavy. The single most common meteorwrong.
The tell: The streak plate: hematite leaves a red-brown streak on unglazed ceramic. Meteorites leave little to none.
Strongly magnetic and dense — it passes the two tests everyone knows about.
The tell: Streak again: magnetite streaks gray-black. And it usually shows crystal faces, which meteorites almost never do.
The tell: Unusual heft, magnet attraction (most types), little to no streak, a thin black fusion crust or thumbprint-like regmaglypts, and bright metal flecks inside a filed corner window.
The three tests, properly
1. The magnet — on a string, never touching
Most meteorites carry iron-nickel metal and pull on a strong magnet. But direct contact erases the stone's natural magnetic record — data scientists use to study the early solar system — so dangle the magnet on a string and bring it close. Deflection is your answer; contact is vandalism.
2. The heft — density you can feel
Meteorites run far denser than common rocks. Even stony ones feel wrong for their size — like picking up a piece of rebar disguised as a river cobble. If it feels like an ordinary rock, it very probably is one.
3. The streak plate — ten seconds, settles most cases
Scratch the rock firmly across the unglazed back of a ceramic tile. Red-brown streak: hematite. Gray-black streak: magnetite. Little to no streak: still in the running. This one test eliminates the two most common meteorwrongs on the spot.
It passed — now what?
- Don't clean, cut, or drill it. Collectors and labs want it exactly as found.
- Record the GPS location. If it's real, where it fell is scientific data.
- File one small window on a corner and look for bright silvery metal flecks inside.
- Get it verified: university meteoritics labs (UNM, ASU, UCLA) examine candidates, as do reputable dealers.
- Then come see every documented fall and find — and where it's legal to hunt for more.
Frequently Asked Questions
How can I tell if a rock is a meteorite at home?
Four checks, in order: heft (meteorites feel too heavy for their size), magnetism (bring a strong magnet close — most meteorites pull, but never touch it to the rock), the streak test (scratch it on the unglazed back of a ceramic tile — meteorites leave little to no streak, while hematite streaks red-brown and magnetite gray-black), and surface texture (a thin black fusion crust or thumbprint-like dents, never bubbles). A rock that passes all four is worth showing to a lab.
Why should I not touch a magnet to a suspected meteorite?
Direct magnet contact erases the natural magnetic record inside the stone that scientists use to study the early solar system. Dangle the magnet on a string and bring it close instead — attraction from a near-miss tells you the same thing without destroying data.
What is the most common rock mistaken for a meteorite?
Industrial slag is the number one meteorwrong, followed by hematite and magnetite. Slag gives itself away with bubbles and glassy froth; hematite and magnetite give themselves away on a streak plate. University labs report that of roughly 7,000 rocks submitted a year, only one or two are real meteorites.
Do all meteorites stick to a magnet?
Most do — iron and stony-iron meteorites strongly, ordinary chondrites noticeably. But rare achondrites (including lunar and martian meteorites) can be weakly magnetic or not at all, so a non-magnetic rock with other strong signs is still worth checking.
What should I do if I think I found a real meteorite?
Don't clean, cut, or drill it. Record the GPS location — if it's real, the find location is scientific data. File one small window on a corner and look for bright metal flecks, then contact a university meteoritics lab (UNM, ASU, and UCLA all examine candidates) or a reputable dealer for verification.
⚠️ Always verify current regulations, weather conditions, and access requirements before visiting any location. Information provided is based on community submissions and may not be current or accurate.
Identification guidance is a field screen, not a verification — only lab analysis confirms a meteorite. Meteorite data: Meteoritical Bulletin Database.