Search results
Results from the WOW.Com Content Network
A meteorite mineral is a mineral found chiefly or exclusively within meteorites or meteorite-derived material. [ citation needed ] This is a list of those minerals, excluding minerals also commonly found in terrestrial rocks.
A "meteorite fall", also called an "observed fall", is a meteorite collected after its arrival was observed by people or automated devices. Any other meteorite is called a "meteorite find". [ 43 ] [ 44 ] There are more than 1,100 documented falls listed in widely used databases, [ 45 ] [ 46 ] [ 47 ] most of which have specimens in modern ...
The bulk of meteoric iron consists of taenite and kamacite.Taenite is a face-centered cubic and kamacite a body-centered cubic iron-nickel alloy.. Meteoric iron can be distinguished from telluric iron by its microstructure and perhaps by its chemical composition also, since meteoritic iron contains more nickel and less carbon.
In meteoritics, a meteorite classification system attempts to group similar meteorites and allows scientists to communicate with a standardized terminology when discussing them. Meteorites are classified according to a variety of characteristics, especially mineralogical , petrological , chemical , and isotopic properties.
Although pallasites are a rare meteorite type, enough pallasite material is found in museums and meteorite collections and is available for research. This is due to several large finds, some of which yielded more than a metric ton. The following are the largest finds: Brenham, Kansas, United States.
Seven IIAB meteorites weigh more than 1000 kg. [6] The Sikhote-Alin meteorite is the heaviest of these and was an observed fall, [ 7 ] while the Old Woman meteorite is, at 38 × 34 × 30 inches (970 × 860 × 760 mm) and 6,070 pounds (2,750 kg) originally, the largest meteorite found in California and the second largest found in the United States.
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, [3] with the exception of the IIE iron meteorite group. [4]
Hexahedrites are a structural class of iron meteorite. They are composed almost exclusively of the nickel – iron alloy kamacite and are lower in nickel content than the octahedrites . [ 1 ] The nickel concentration in hexahedrites is always below 5.8% and only rarely below 5.3%.