Recognized by scientists. How many types of meteorites are there?

Most meteorites come from the asteroid belt between Mars and Jupiter, and a small number from the Moon and Mars. Meteorites can be roughly divided into stony meteorites, iron meteorites, and mixed meteorites of stone and iron.

The average density of meteorites is between 3 and the main component is silicate. Meteorite has a density of iron and is mainly composed of iron and nickel. The meteorite composition is somewhere in between, with a density in between.

Meteorites vary in shape, the largest meteorite is the Jilin No. 1 meteorite, which weighs 1,770 kilograms, and the largest meteorite is the Goba meteorite from Namibia, which weighs about 60 tons. The crown of Chinese meteorites is the "silver camel" found in Qinghe County, Xinjiang, weighing about 28 tons. [2]

More than 40,000 meteorite samples have been collected worldwide, in a variety of styles. They can be broadly divided into three main categories: stony meteorites (the main component is silicate), iron meteorites (iron-nickel alloys), and stony-iron meteorites (iron and silicate mixtures).

Meteorite refers to the remnants of meteorites that fall to the ground, which are composed of minerals such as iron, nickel, and silicate, and are also known as meteorite stones. It also refers to meteorites that contain more or all of the stony material. A large amount of organic matter such as ammonia, nucleic acids, fatty acids, pigments, and 11 kinds of amino acids have also been found in meteorites with high carbon content, so it is believed that the origin of life on Earth has a considerable relationship with meteorites.

Scientists believe that meteorites can be divided into three categories: meteorites, or iron meteorites, whose main components are metal elements such as iron and nickel, such as iron accounts for about 90%, nickel accounts for 5%-8%, or more. The world's largest meteorite is known to have a mass of about 60 tons, and it is still located in the original landing site in southern Namibia, Africa.

This is an ochre-like stone, not a meteorite.

Ochre is an aggregate of oolitic, bean-shaped, and kidney-shaped, mostly irregular flat blocks. Ochre is an oxide mineral corundum hematite, mainly containing ferric oxide (Fe2O3). Dark brownish-red or grayish-black, streaked cherry red or reddish-brown, some with a metallic sheen.

Meteorites have always been important specimens for the study of celestial bodies, and it is now known from meteorites that space contains many kinds of organic molecules, which provide information for the study of the origin and evolution of life. Ancient meteorites have been impregnated by organic matter on the earth due to their long landing time, and the research value of this aspect has been lost, but it is still meaningful to do some statistical analysis of the historical meteorite record.

Judging by your **, this is not a meteorite.

To determine whether a sample is a meteorite, the following aspects can be considered:

1. Molten crust: The meteorite has to pass through the dense atmosphere before falling to the ground, and the meteorite rubs with the atmosphere during the landing process to produce high temperatures, causing the surface to melt and form a thin layer of molten crust. As a result, the surface of the newly landed meteorite has a black molten crust with a thickness of about 1 mm.

2 Surface air marks: In addition, due to the interaction between the meteorite and the air current, the surface of the meteorite will also leave many air marks, like finger prints.

3 Internal metals: Iron meteorites and stony-iron meteorites are composed of metallic iron, which has a high nickel content (5% to 10%). Chondrites also have metal particles inside, and fine metal particles can be seen on fresh fracture surfaces.

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), and these meteorites contain a large number of millimeter-sized silicate spheres called chondrites. Round chondrites can be seen on the fresh fracture surface of chondrites.

Characteristics of meteorites.

Stony meteorites are composed of silicate minerals such as olivine, pyroxene and a small amount of plagioclase, and also contain a small amount of metallic iron particles, sometimes up to more than 20. Density 3 to. Stony meteorites account for 95% of the total number of meteorites.

At 15 o'clock on March 8, 1976, a meteorite rain fell in Jilin area within an area of 12 kilometers from east to west and 8 kilometers from north to south, with a total area of more than 500 square kilometers. More than 200 meteorites were collected, and the largest No. 1 meteorite weighed 1,770 kilograms, ranking the heaviest single meteorite in the world. On the surface of the Jilin meteorite, there are black, black-brown molten crusts and gas marks of different sizes.

The chemical composition is SiO2, Mgo2 and Fe. The main minerals are olivine, bronze pyroxene, ferrolite and meteorite iron; Minor minerals are monoclinic pyroxene, plagioclase, etc.