Meteorite identification with eyes 2

Meteorite identification with eyes .

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Visual Identification: Fusion Crust
When a meteoroid (a potential meteorite) streaks through our atmosphere, tremendous heat is generated by atmospheric pressure. The surface of the rock melts and the air around it incandesces. As a result of this brief but intense heating, the surface burns and forms a thin, dark rind called fusion crust.

Meteorites literally began to burn up in our atmosphere, so they tend to appear darker than the terrestrial rocks around them. Desert varnish forms on the surface of some earth rocks, particularly in arid areas, and can easily be mistaken for fusion crust by an untrained eye. True fusion crust does not occur on earth rocks. It is delicate and will weather away over time, but a freshly fallen meteorite will exhibit a rich black crust, much like a charcoal briquette.

Visual Identification: Regmaglypts
Regmaglypts, popularly known as thumbprints, are oval depressions-often about the size of a peanut-found on the surface of many meteorites. These indentations look much like the marks a sculptor might make with his fingers on a wet lump of clay, hence their name. Regmaglypts are created as the meteorite's outer layer melts during flight and they are another feature unique to meteorites.
Visual Identification: Flow Lines
As our typical meteorite burns through the atmosphere, its surface may melt and flow in tiny rivulets known as flow lines. These patterns formed by flow lines can be minute, often thinner than a strand of human hair, and they are one of the most unique and intriguing surface characteristics of meteorites.
Visual Identification:
Chondrules and Metal Flakes
Stone meteorites known as chondrites are the most abundant meteorite type. They are composed largely of chondrules, which are miniscule, grain-like spheroids, often of differing colors.

Chondrules are believed to have formed in the solar disk before the planets in our solar system and are not present in earth rocks. Chondrites are also typically rich in metal flakes of iron-nickel, and shiny blobs of this extraterrestrial alloy are often visible on their surfaces, though you may need a hand lens to see them.

A simple test involves removing a small corner of a suspected stone meteorite with a file or bench grinder and examining the exposed face with a loupe. If the interior displays metal flakes and small, round, colorful inclusions, it may well be a stone meteorite.
Oriented meteorites are the result of the fortuitous distribution of its mass prior to atmospheric entry and its angle of entry. The parabolic "heat shield" curvature seen here was naturally sculpted as a result of frictional heating with Earth's atmosphere.

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