165438+1On October 20th, the 27th Chengdu International Jewelry Fair was held in the new convention and exhibition center, and a meteorite exhibition area was set up in the corner of the exhibition hall. Meteorite collectors from all over the country come up with their own collections to communicate with them. These meteorites include stone meteorites, iron meteorites, glass meteorites and many other types. Known as "whispers" from outer space, the mysterious identity of meteorites has attracted many citizens to explore.

Glass meteorites displayed by collectors.

Two colorful meteorites displayed by collectors, one is artificially polished and the other is original stone.

Various meteorites appeared.

distinguish

To identify whether a sample is a meteorite, we can consider the following aspects:

External molten crust: meteorites will pass through the dense atmosphere before falling to the ground. During the falling process, the meteorite will rub with the atmosphere to produce high temperature, which will melt its surface and form a thin molten shell. Therefore, all newly landed meteorites have a black molten shell with a thickness of about1mm.

2. Surface air marks: In addition, due to the interaction between meteorites and large airflow, many air marks will be left on the surface of meteorites, just like fingerprints pressed by fingers.

3. Internal metal: Iron meteorites and stone iron meteorites are composed of metallic iron, which has a high nickel content (5- 10%). There are also metal particles in chondrites, and fine metal particles can be seen on fresh fractures. 4. Magnetism: Because most meteorites contain iron, 95% of meteorites can be attracted by magnets.

5. Sphere: Most meteorites are chondrites (accounting for 90% of the total), and there are a lot of silicate spheres in these meteorites, which are called chondrites. A round chondrite can be seen on the fresh fracture of chondrite.

6. Specific gravity: The specific gravity of iron meteorites is 8g /cm3, which is much larger than that of ordinary rocks on the earth. Because chondrites contain a small amount of metals, their specific gravity is also very heavy.