Extraterrestrial Meteorites
Every meteorite comes from outer space billions of years ago and has witnessed the rich history of the formation and evolution of celestial bodies in the solar system. Every meteorite is a gift from the universe and is extremely valuable. Every meteorite is also Contains a strange mystery
The characteristics of meteorites:
Meteorites are burned and abraded in the atmosphere, and their shapes are mostly round without edges or corners. Molten craters: The surface of meteorites is covered with pits of varying sizes and depths, known as molten craters. Many meteorites also have shallow and long air marks, which may be left by the falling off of low-melting point minerals. Specific gravity: Because meteorites contain iron and nickel, the specific gravity can be up to 8. stone meteorites also often contain 20% iron and nickel, so they have a larger specific gravity than ordinary rocks. Magnetism: Various meteorites have magnetism of varying strengths because they contain iron. Weathered meteorites are not magnetic and therefore are not considered meteorites. Streaks: Meteorites generally have no streaks or only light gray streaks when rubbed on unglazed porcelain , while the streaks of iron ore are black or brown-red, so as to distinguish them.
Rarity: The rarity of a meteorite determines its own value. Relatively speaking, the smaller the quantity, the higher the value. The principle that rare things are valuable is also reflected in meteorite collection.
1. Industry recognition: After a meteorite is discovered, it undergoes scientific testing and identification, and then publishes the "Meteorite Bulletin" through the authoritative International Meteorite Association and the Chinese Meteorite Collectors Association. It participates in the National Meteorite Cultural Exchange Conference held every year and obtains industry recognition. recognized. Only such meteorites have the possibility of reflecting value.
2. Freshness: The freshness of a meteorite determines its value. Excluding quantitative factors, fresh meteorites are of high value from the perspective of scientific research and collection. The freshness of the witnessed meteorites determines their extremely high value.
3. Time factor: Due to the promotion of meteorite culture and the rise of the meteorite market, the change in the supply and demand relationship of meteorites caused by the knowledge and understanding of meteorites, the sharp increase in the group of meteorite enthusiasts, the precipitation and storage of meteorites after a certain period of time, society A sharp decrease in the number of meteorites in circulation will cause a significant increase in the value of meteorites.
4. Type of meteorite: The type of meteorite is crucial to the value of the meteorite. Whether it is a rare type or a common type determines the value of the meteorite. In the past, the scientific community and the meteorite community pursued research on Mars and the moon. Now they are paying more attention to the study of the relationship between meteorites and life. Meteorite evidence related to life is being favored by scientific research institutions in various countries.
Below, I will explain to you whether a sample is a meteorite. , you can consider from the following aspects:
1. Surface fusion crust: The meteorite has to pass through a dense atmosphere before falling to the ground. During the fall, the meteorite rubs against the atmosphere and generates high temperatures, causing its surface to melt and form a thin fusion crust. Therefore, the surface of newly landed meteorites has a layer of black molten crust with a thickness of about 1 mm.
2． Surface air print: In addition, due to the interaction between the meteorite and the atmospheric current, many air prints will be left on the surface of the meteorite, just like fingerprints pressed by fingers.
3． Internal metal: iron meteorite and stony iron meteorite is composed of metallic iron . The nickel content of this iron is very high (5-10%). There are also metal particles inside the chondrule meteorite, and small metal particles can be seen on the fresh fracture surface.
4. Magnetism: Because most meteorites contain iron, 95% of meteorites can be attracted by magnets.
5． Chondrites: Most meteorites are chondrites (90% of the total). These meteorites contain a large number of millimeter-sized silicate spheres called chondrites. Round chondrules can be seen on fresh fracture surfaces of chondrites.
6． Specific gravity: The specific gravity of iron meteorites is 8 g/cm3, which is much greater than the specific gravity of ordinary rocks on the earth. Because chondrites contain a small amount of metal, their specific gravity is also heavier
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