Jake

meteorites
there are two main types of meteorites the fall to earth stoney and metal but there are many, many differnt types of chemical compasitions. around 90% of all meteorite that fall are stoney.but most of them are tiny or shatter on impact on the other hand iron meteroites can take extreme heat, impact and can be buried in soil for long periods of time with out curroading.



Kamacite- -this is essentially metallic iron with up to 7.5% nickel in solid solution. In cut sections kamacite looks like metallic iron and like the other important nickel-iron mineral, taenite. On etched and polished surfaces, sometimes it can be distinguished. Taenite --this is iron with more than 25 percent nickel in solid solution. Polishing sometimes allows one to distinguish taenite. Because it is harder it stands out. Plessite- -this is not a mineral, but is a mixture of fine-grained kamacite and taenite. Scientists have distinguished several types of plessite based on microscopic structures.
 * Metallic Iron**

Troilite --FeS--Iron sulfide similar to the earthly mineral pyrrhotite. Troilite is not magnetic. It is metallic with a slight bronze color and slight greenish tint. Daubreelite --FeCr2S4--This iron chrome sulfide.
 * Iron Sulfides**

Cohenite --(Fe,Ni,Co)3C--is iron carbonate it is closely related to cementite (Fe3C), a mineral described in steel. It is brilliant silver. The crystal form is orthorhombic. Cohenite is extremely hard and will quickly dull saw blades. Haxonite- -(Fe,Ni,Co)23C6--is a cubic iron carbide similar to minerals found in steel. It to is hard, though not as hard as Cohenite. It is bright silver.
 * Iron Carbides**

Chromite --FeCrO4--This ore of chrome is common on earth and as a trace mineral in iron meteorites. It is black. Magnetite- -Fe3O4--A common ore of iron on earth is found in the crusts of most meteorites. Magnetite is submetallic black. corundum --Al2O3--This mineral is what rubies and sapphires are made of--it is also a trace mineral in meteorites. Dont look for red or blue. Gray is the probable color.
 * Oxides**

graphite- -C--The common mineral of pencil lead is common as nodules in Iron meteorites and in carbonaceous chondrites. It is black and very soft. Diamond --C--This is the same element as graphite. When graphite is subjected to the extraordinarily high temperature and pressure of meteorite impact, sometimes diamonds will form. Lonsdaleite --C--A hexagonal polymorph of diamond (diamond is cubic). Silicate Minerals Pyroxenes --A group of mostly dark colored rock-forming minerals common on Earth and in meteorites. The following is a list of a solid solution series that gradually decreases in magnesium and increases iron content:
 * Carbon**


 * Enstatite --Mg2Si2O6--The end member--the one highest in magnesium. It is grayish to yellowish to brown and an important rock former on Earth.
 * Bronzite- -(Mg,Fe)SiO3--This member is usually brown or green and often having a pearly luster. It has more iron than enstatite and more magnesium than hypersthene.
 * Hypersthene --(Mg,Fe)SiO3--This mineral is similar to bronzite in many ways, but having more iron, it will tend to be darker--even black.
 * Orthoferrosilite --FeSiO3--This is the other orthopyroxene end member. It has the most iron and the least magnesium.

Olivine --(Mg,Fe)2SiO4--is a rock forming mineral on Earth that is believed to have been formed at great depth. The Earth's mantle may have significant olivine. In meteorites, olivine is important in some pallasites.



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