First, shape: mostly round and oval, like masonry.
Second, surface characteristics: the surface is covered with pits of different sizes and depths, which is a bit like limestone dissolution surface. Fresh has a molten shell, the black surface layer is about one millimeter, and it is composed of glassy or aphanitic layer. There are often shallow and long air prints or mother-child prints (strongly oxidized ones may be lost). Some are surrounded by sulfate epiphytes.
Third, the specific gravity: iron meteorites contain more than 95% of iron and nickel, and the specific gravity is generally more than 8 grams per cubic centimeter. Stone meteorites are also heavier than ordinary rocks.
4. Because it contains iron and nickel, it mostly exists in the form of natural metals, and there are some special combinations of metal minerals, such as lepidolite, biotite, meteorite sulfur iron, meteorite phosphorus iron, meteorite oxygen iron and meteorite carbon iron nickel ore. There are no hydrous minerals.
5. Structural characteristics: Most of them belong to chondrites. Observed by 10 times square microscope, fresh slices can be seen with round chondrules, which are similar to fish eggs and filled with silver-gray metal minerals. After cutting and polishing, iron meteorite or iron meteorite is dissolved with dilute nitric acid and alcohol, and a network pattern composed of flaky or tabular aragonite and taenite crystal can be seen. It is called Weiss step structure. This is an iron-nickel phase that melts uniformly at high temperature. Melted and formed in the unique slow cooling of the universe.
6. Magnetism: Because meteorites contain 20%-90% iron, they are often magnetic. When looking in the wild, it is best to bring a magnet (except those with severe weathering).
Vii. Stripe color: When rubbed on white unglazed porcelain plates, most of them have no or only light gray (molten shell) stripe color, while the stripe colors of rich iron ore and hematite on the earth are black and pink (reddish brown) respectively.
So it's not a meteorite, otherwise meteorites will be everywhere.