Let’s start with some of the oldest meteorites in the solar system: chondrites. Those designated LL have between 1 and 3% iron-nickel metal. There is nothing commonplace about meteorites. One group of chondrites (CB) has over 50% metal by volume and contains meteorites that were called stony irons until their affinities with chondrites were recognized. The Meteoritical Society categorizes chondrites by class and chemistry: . 4,567 Ma - and their abundances of nonvolatile elements are close to those in the solar photosphere. Chondrites: The Most Abundant Type of Meteorite. The C chondrites represent only a small proportion (4.6%) of meteorite falls. Meteorites designated H have between 15 and 19% iron-nickel metal. They contain water and formed in an oxygen-rich part of the solar system. Carbonaceous Chondrites. Those designated L have between 1 and 10% iron-nickel metal.   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 Chondrites Are the Oldest Meteorites in the Solar System. 1.07.2.3 Carbonaceous Chondrites. Some carbonaceous chondrites are rich in carbon (CI and CM chondrites have 1.5–6% carbon), but others are not. They include some of the most primitive known meteorites. Most (~85%) stony meteorites are ordinary chondrites. Ordinary chondrites contain iron-nickel metal and, consequently, will attract even a cheap magnet. Ordinary chondrites - constitute about 74% of the meteorites falling to Earth. Enstatite chondrites - comprise about 2% of the meteorites falling to Earth. The Ordinary Chondrites are arranged with higher iron meteorites first. Some famous carbonaceous chondrites are: Allende, Murchison, Orgueil, Ivuna, Murray, Tagish Lake, and Sutter's Mill Their most abundant component is a magnesium silicate mineral called enstatite (Mg 2 Si 2 O 6). These meteorites are very pristine, meaning they haven’t been melted or altered much since their formation. Scott, A.N. 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. Krot, in Treatise on Geochemistry, 2007. Ordinary Chondrites. To find out more, visit our type table.. E.R.D. Carbonaceous chondrites generally have Mg/Si ratios near the solar value, and oxygen isotope compositions that plot below the terrestrial fractionation line. 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. 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. C chondrites (carbonaceous) are some of the most pristine material known; their composition closely matches the sun. 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. Most of the matrix of the chondrites is made of the original condensates in the protoplanetary disk. In fact, the term "stony iron" is a misnomer as currently used. Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. All chondrites are essentially made of chondrules stuck together during the process of accretion and are considered to be undifferentiated. 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. 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