Visual Characteristics:
* Fusion Crust: A dark, often glassy or rough coating on the surface formed by the intense heat of atmospheric entry. It can be thin and may flake off, exposing the interior.
* Regmaglypts: Dents or indentations on the surface caused by the melting and flowing of the outer layers during atmospheric entry.
* Metallic Appearance: Meteorites often have a metallic sheen due to the presence of iron and nickel. This is especially evident in iron meteorites.
* Shape: Meteorites typically have an irregular, often rounded shape, as opposed to the sharp, angular shape of terrestrial rocks.
* Weight: Meteorites are denser than most rocks, feeling heavier than their size suggests.
Magnetic Properties:
* Iron Content: Most meteorites contain iron, making them magnetic. This can be tested with a strong magnet.
Internal Characteristics:
* Widmanstätten Pattern: A unique, intricate pattern of intersecting lines visible on the etched surface of iron meteorites. This is a distinctive feature of meteorites and is not found in terrestrial rocks.
* Chondrules: Round or irregularly shaped grains found in chondritic meteorites. These are small, glassy particles that formed in the early solar system.
Important Notes:
* Not all meteorites have all of these features. Some may have a very thin fusion crust or no visible regmaglypts.
* Many terrestrial rocks can also exhibit some of these features. This is why it's important to consider the context in which the object was found.
If you think you've found a meteorite:
1. Don't handle it too much. The oils from your hands can contaminate the meteorite and make it harder to identify.
2. Take detailed photos. Include close-ups of the surface, any fusion crust, and any metallic or unusual features.
3. Contact a local university or museum with a geology department. They can provide advice and potentially have experts who can help you identify the object.
4. Do your research. There are many resources available online, including the Meteoritical Society website and the American Meteor Society forum.
Remember, finding a meteorite is a rare event. If you're unsure, it's always best to err on the side of caution and consult with an expert.
