Detailed self-identification method of meteorites?

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

1. External melting 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 melting 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.

Extended data:

Collection value:

The more expensive meteorites in the world are from the moon and Mars, about 6,000 dollars, or 30,000 RMB per gram. Cheap desert meteorites have a higher degree of weathering, 65438 yuan +0 Yuan Yuan per gram. If there are many witnesses when it falls, the price is from 40 yuan to 50 yuan per gram.

At present, among all kinds of meteorites in China, the meteorite called black sapphire is more valuable than the moon and Mars meteorites, because at present, human beings can't judge its source, and it is likely to come from the planet produced during the Big Bang 65.438+0.5 billion light years away.

This is very helpful for studying the boundary and formation of the universe. In the process of crossing the atmosphere, it crashed into the desert of the earth after high-speed autobiography, so it is well preserved, the molten shell is relatively complete, the surface is bright, and the whole body is black and green, which has high collection and research value.

A 2750g black sapphire meteorite, the best preserved in China, was bought by a mysterious collector in Beijing for 40 million RMB. It's not a moon meteorite or a Martian meteorite, and its source is unknown. It is the only one in the world. At present, the valuation is more than 60 million RMB, and the unit price is more than 20 thousand RMB per gram, so there is a lot of room for appreciation in the future.

Baidu encyclopedia-meteorite