How to Identify Meteorites

Here is the honest truth up front: the overwhelming majority of rocks people believe are meteorites are not meteorites. They are ordinary terrestrial rocks, industrial slag, or iron-rich minerals like hematite and magnetite. Meteorites are genuinely rare, and most fresh falls that reach the ground are small. That does not mean you should give up — it means you should test carefully and stay skeptical, because the clues below are how real finds are separated from the far more common “meteor-wrongs.”

What a meteorite actually is

A meteorite is a fragment of rock or metal from space — usually an asteroid, occasionally the Moon or Mars — that survived its fiery passage through the atmosphere and landed on Earth. Meteorites fall into three broad families:

• Iron meteorites. Almost entirely iron-nickel metal. Dense, heavy, and strongly magnetic. When cut and etched they can reveal a distinctive crosshatch pattern called Widmanstätten figures that cannot be faked by ordinary steel.
• Stony meteorites. The most common type that falls, but the hardest for beginners to recognize because they can look like ordinary rock. Many contain small round grains called chondrules and scattered flecks of metal.
• Stony-iron meteorites. A mix of metal and silicate minerals. Rare and often striking — pallasites, for example, hold green olivine crystals in a metal matrix.

Visual clues to look for

Before you touch a magnet, look closely at the specimen — ideally with a hand lens in good light. Real meteorites tend to share a few features:

• Fusion crust. A thin, dark, often matte-black rind formed as the surface melted during entry. On a fresh fall it looks like a burnt eggshell; on an older one it may be brown and weathered.
• Regmaglypts. Shallow, thumbprint-like dents across the surface, as if pressed into soft clay. These form as hot air scours the melting exterior.
• Chondrules. Tiny spherical grains visible on a cut or broken face of a stony meteorite — a feature found in no earthly rock.
• Metal flakes. Bright, silvery specks of iron-nickel metal on a filed or broken surface. Genuine metal, not the sparkle of mica.

The magnet test

Because most meteorites contain iron-nickel, a strong magnet — a neodymium magnet works best — will visibly pull toward them or stick lightly. If a magnet shows no attraction at all, a meteorite becomes much less likely (though a few rare stony types are only weakly magnetic). Be aware that this test cuts both ways: many terrestrial rocks, especially magnetite-bearing ones, are also magnetic. A positive magnet test is necessary for most meteorites but is nowhere near sufficient to confirm one.

The density and weight test

Meteorites feel wrong in the hand — unusually heavy for their size. This is because of their metal content and dense minerals. Pick up your specimen and compare it to an ordinary rock of the same size: a meteorite should feel noticeably heavier. Iron meteorites in particular feel startlingly dense. A rock that feels light and airy for its size is almost certainly not a meteorite.

The streak test

Drag the specimen across an unglazed ceramic tile (the back of a bathroom tile works). Meteorites leave little to no streak, or at most a faint gray one. The most common impostor, hematite, leaves a distinct reddish-brown streak. If your rock streaks rusty red, it is almost certainly hematite, not a meteorite.

Red flags: signs it is NOT a meteorite

Some features effectively rule out a meteorite. If your specimen shows any of these, be very skeptical:

• Holes or bubbles (vesicles). Meteorites almost never have holes. A bubbly, sponge-like texture points to slag or volcanic rock like pumice.
• Light color throughout. Most meteorites are dark. A pale, chalky, or uniformly light rock is rarely from space.
• No metal at all. File a small window on an edge — no metallic flecks and no magnetism together make a meteorite very unlikely.
• Rounded, perfectly spherical, or layered. Rounded river cobbles and layered sedimentary rocks are terrestrial. Meteorites are not water-worn.

Where a photo scan fits in

If you have a candidate in hand, a photo-based tool like the free Stone Sense rock scanner can give you a fast first read — flagging whether your specimen even looks like a meteorite candidate versus an obvious slag or hematite. Pair that with the magnet, density, and streak tests here. If you want unlimited scans, a saved collection, and follow-up explanations, the full rock identifier app and mineral identifier app go deeper. But for anything you truly suspect is from space, treat every digital and at-home result as a first step toward professional verification — not a verdict.

Frequently asked questions

How can I tell if my rock is a meteorite?

Check for a dark fusion crust, thumbprint-like dents, and metal flecks on a filed edge. Most meteorites are unusually heavy and are pulled by a strong magnet. Treat these as first filters only — confirm any real candidate with an expert.

Are all meteorites magnetic?

Most are, thanks to their iron-nickel content, but not all. Some rare stony meteorites contain little metal and are only weakly magnetic, so a weak magnet response alone does not rule a meteorite out.

Can an app identify a meteorite?

An app can flag a specimen as a possible candidate from a photo, but it can never confirm a meteorite. Confirmation depends on internal structure and composition that no photo can measure, so a lab is always required for a serious find.

What is the most common meteorite impostor?

Industrial slag, hematite, magnetite, and rusty man-made iron are the usual suspects. Slag tends to have holes, hematite streaks red, and magnetite is magnetic but has no fusion crust.