Why do meteorites have different shapes?

What the meteorite looks like should be related to the type of meteorite material and the distance from the ground where the meteorite lands, as well as the size of the meteorite itself. In general, the external characteristics of stony meteorites such as molten shells, gas marks, and melt flow lines are more obvious, because its material is relatively easy to burn. On the other hand, stony-iron meteorites (ferrosilicate meteorites, ferric silicide) and iron meteorites are not too obvious in their external characteristics.

Meteorites with less obvious external features.

The interior of iron meteorites and stony-iron meteorites is composed of metals, which have a high nickel content of 5%-10%, and chondrites are also found inside, and fine metal particles can be seen on fresh fracture surfaces. The specific gravity of iron meteorites is 8 grams 3, which is much higher than the specific gravity of ordinary rocks on Earth. Various meteorites have magnetic properties of varying intensity because they contain iron, and about 95% of meteorites can be attracted by magnets.

However, weathered meteorites are not magnetic, so they are not meteorites.

When the meteorite passes through the earth's atmosphere, the surface temperature reaches several thousand degrees Celsius, and at such a high temperature, the surface of the meteorite usually melts into liquid, and the temperature will slowly decrease when passing through the atmosphere, and the melted surface will slowly cool down, forming a thin shell called "melt shell", which is generally very thin, black and brown in color. Meteorites also leave air marks when they pass through the atmosphere, that is, they are blown by the wind when they cool, which are the two main characteristics of meteorites.

The types of meteorites are basically iron meteorites, olivine meteorites, medium iron meteorites, stony meteorites with small iron content, glass meteorites, rare and difficult to find the moon, and Martian meteorites. Rare cosmic extragalactic meteorite. If you want to collect meteorites, you should start with a new landing meteorite as the main line, and directional landing meteorites as the first choice.

This is followed by a new landing meteorite of different kinds. I feel that the old meteorite with a scarce variety is OK. The age is very ancient, the meteorite with little skin and no appearance, and the quality is very poor.

<> genuine from outside the world.

One of the pieces opened for everyone to enjoy.

Answer: The six characteristics of meteorites are: 1. High specific gravity; 2. There is metal inside; 3. The surface molten shell is thinned due to atmospheric friction; 4. a round spherical shape; 5. There is an air mark on the surface; 6. It can be adsorbed by magnets. Meteorites, also known as "meteorites", are unburned stone, iron, or a mixture of rocky and iron materials that are scattered on the surface of the Earth or other planets by cosmic meteors or dust fragments that have left their original orbits outside the Earth.

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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.

What is the shape of a meteorite?

After several years of study, exploration, and research, my personal understanding of meteorite morphology is "rich and diverse, ever-changing" First of all, let's talk about the most common forms of meteorites. The "almond shape" resembles a large almond. The "foot shape" is like the shape of a foot.

Warhead-shaped" is a typical representative of the directional fall of meteorites! "Square" here is not what we call a cube or a cuboid, but a deformed square form.

Here we focus on the meteorite fall process, the form of section melting, the strength of section melting is closely related to the height of the meteorite, the higher from the ground, the stronger the melting, on the contrary, the melting will be very weak, sometimes too close to the ground, the fracture surface has not had time to melt has landed, and some fragments have not even formed a melting shell has fallen, which increases the difficulty of identifying this type of meteorite.

The fracture surface melt is a strong evidence to prove the identity of the meteorite, and even some fracture surface melted meteorites, we can imagine what kind of shape the meteorite was before **!! If you have anything to add, please let your friends talk freely!

"Molten shells".

1. High-temperature oxidation (melting) (short-term formation) is a characteristic of meteorites. There are two main types of molten shell surface characteristics, one type of molten shell is charred and has a rough surface. The other type is glassy, with a smooth surface and raised flow lines.

This kind of shell is mostly black in color, and the shell has obvious boundary and color difference with the stone, and the connection with the stone is not tight, and it will fall off.

Therefore, most old meteorites have no shell or have a little residue.

Again, the molten crust has a sense of thickness (mostly about 1 mm, but also thin, Ningqiang meteorite is millimeters, and the thick one is 2 3 mm).

2. Slow oxidation (long-term formation), most pebbles and jadeite have (oxidized) shells, and some Hetian jade seeds are also available.

In this type of stone section, the color of the rock gradually changes.

The shell is tightly connected with the stone, there is no obvious boundary, and the "shell" is smooth.

3. Black (or dark) adhesion on the surface of the stone.

1. Long-term mineral infiltration.

2. It has been smoked by natural or man-made fireworks.

Most of these stones have an old feeling, giving a burning feeling, and the surface is black (dark) "shell" without a sense of thickness.

Fourth, oxidation shedding layer, nodule stones, stones with layered structure.

There is a phenomenon of surface laminar detachment, which is generally thick (more than 2 mm).

There is little contrast between the shedding layer and the stone color, and the tissue is crisp and loose.

Fifth, the desert brown shell, I personally think that it is not a molten shell, but the result of the combined effect of iron oxidation and desert paint.

The formation of molten crust is related to the stone quality, the angle of incidence, the speed of the fall, the weather at the time of the fall and other conditions.

After the meteorite landed, it has a lot to do with the condition of the ground, the length of time it has landed, and the preservation environment of the landing.

It's similar to a normal stone, except that it's larger than a normal stone.