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Meteoric iron. Meteoric iron, sometimes meteoritic iron, [1] is a native metal and early-universe protoplanetary-disk remnant found in meteorites and made from the elements iron and nickel, mainly in the form of the mineral phases kamacite and taenite. Meteoric iron makes up the bulk of iron meteorites but is also found in other meteorites.
Iron meteorites, also called siderites or ferrous meteorites, are a type of meteorite that consist overwhelmingly of an iron–nickel alloy known as meteoric iron that usually consists of two mineral phases: kamacite and taenite. Most iron meteorites originate from cores of planetesimals, with the exception of the IIE iron meteorite group
Widmanstätten pattern. Widmanstätten patterns, also known as Thomson structures, are figures of long phases of nickel – iron, found in the octahedrite shapes of iron meteorite crystals and some pallasites. Iron meteorites are very often formed from a single crystal of iron-nickel alloy, or sometimes a number of large crystals that may be ...
Pallasite. A slice of the Esquel pallasite, clearly showing the large olivine crystals suspended in the metal matrix. The pallasites are a class of stony–iron meteorite. They are relatively rare, and can be distinguished by the presence of large olivine crystal inclusions in the ferro-nickel matrix.
Neumann lines. Neumann lines, or Neumann bands, are fine patterns of parallel lines seen in cross-sections of many hexahedrite iron meteorites in the kamacite phase, although they may appear also in octahedrites provided the kamacite phase is about 30 micrometres wide. They can be seen after a polished meteorite cross-section is treated with acid.
About 4–10% iron–nickel is found as a free metal, making these meteorites magnetic, but not as strongly as the H chondrites. [citation needed] Mineralogy. The most abundant minerals are olivine and hypersthene (an orthopyroxene), as well as iron–nickel and troilite. Chromite, sodium-rich feldspar and calcium phosphates occur in minor amounts.
A man in Michigan recently learned that what he thought was large rock is actually a rare meteorite with an estimated value of $100,000. 30-year-old doorstop turns out to be a rare meteorite Skip ...
Hoba is a tabular body of metal, measuring 2.7×2.7×0.9 m (8 ft 10 in×8 ft 10 in×2 ft 11 in). In 1920, its mass was estimated at 66 tonnes. Erosion, scientific sampling and vandalism reduced its bulk over the years. The remaining mass is estimated at just over 64 tonnes. The meteorite is composed of about 84% iron and 16% nickel, with traces ...