Some famous carbonaceous chondrites are: Allende, Murchison, Orgueil, Ivuna, Murray, Tagish Lake, and Sutter's Mill In fact, the term "stony iron" is a misnomer as currently used. Carbonaceous chondrites generally have Mg/Si ratios near the solar value, and oxygen isotope compositions that plot below the terrestrial fractionation line. They have come to us from space, can give us clues to the makeup of our neighboring celestial bodies, and can even help us to understand how the Solar System evolved; so the term ordinary chondrite might seem a little misleading. The brightest materials in each photo are metal grains (veins in “Richarton”). It is thought that these chondrites formed within the orbit of Mars. Meteorites designated H have between 15 and 19% iron-nickel metal. These meteorites are very pristine, meaning they haven’t been melted or altered much since their formation. The ordinary chondrites are thought to have originated from three parent asteroids, whose fragments make up the H chondrite, L chondrite and LL chondrite groups respectively. Scott, A.N. Enstatite chondrites - comprise about 2% of the meteorites falling to Earth. Below are some photos of sawn faces of ordinary chondrites. 1.07.2.3 Carbonaceous Chondrites. Chondrites Are the Oldest Meteorites in the Solar System. E.R.D. Carbonaceous chondrites or C chondrites represent some of the most pristine matter known, and their chemical compositions match the chemistry of the Sun more closely than any other class of chondrites. Some carbonaceous chondrites are rich in carbon (CI and CM chondrites have 1.5–6% carbon), but others are not. C chondrites (carbonaceous) are some of the most pristine material known; their composition closely matches the sun. Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. They include some of the most primitive known meteorites. Krot, in Treatise on Geochemistry, 2007.   When we look at primitive chondrites, we are getting a glimpse of what we would have seen very early in the formation of out solar system The H type ordinary chondrites are the most common type of meteorite, accounting for approximately 40% of all those catalogued, 46% of the ordinary chondrites, and 44% of the chondrites. Within the H, L and LL categories, less altered meteorites are listed first. Ordinary Chondrites. Chondrites: The Most Abundant Type of Meteorite. The Meteoritical Society categorizes chondrites by class and chemistry: . This is because their parent bodies have not undergone the process where metal separates (or differentiates) from silicates to form a core and mantle, a process that also destroys (or encrypts) the chondrules. Some iron meteorites also contain many … What are Chondrites?Chondrites are meteorites that provide the best% clues to the origin of the solar system. Ordinary chondrites - constitute about 74% of the meteorites falling to Earth. 4,567 Ma - and their abundances of nonvolatile elements are close to those in the solar photosphere. Most (~85%) stony meteorites are ordinary chondrites. Their most abundant component is a magnesium silicate mineral called enstatite (Mg 2 Si 2 O 6). Those designated LL have between 1 and 3% iron-nickel metal. The Ordinary Chondrites are arranged with higher iron meteorites first. There is nothing commonplace about meteorites. Carbonaceous Chondrites. Ordinary chondrites contain iron-nickel metal and, consequently, will attract even a cheap magnet. Most of the matrix of the chondrites is made of the original condensates in the protoplanetary disk. 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