A number, from 1 to 7, indicating the petrologic type, as determined in 1967 by W. Ordinary chondrites are classified according to the amount of iron they contain, and are divided into three groups: H, L, and LL with "H" indicating a high iron content and the "L" and "LL" types containing lower amounts of metal.
Testing a suspected chondrite with a powerful rare earth magnet is always our first step when hunting for meteorites in the field. The metallic content makes OCs feel heavier than earth rocks, and they will easily adhere to a strong magnet. The Classification of ChondritesĪll ordinary chondrites (OCs) contain abundant flecks of the same extraterrestrial nickel-iron that comprises iron meteorites. Photograph by Geoffrey Notkin, copyrightĪerolite Meteorites. Strewnfield, and the author hunting for stone meteorites with hand-held Meteorite hunting in Arizona: The late Professor Jim Kriegh (above left), discoverer of the Gold Basin Chondrites take their name from the chondrules they contain - small grain-like spheres of varying sizes and colors. Ordinary chondrites are the most common type of meteorite, but they are still rarer than platinum or diamonds. 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. There is nothing commonplace about meteorites. Photograph by Leigh Anne DelRay, copyright Aerolite Meteorites. Regmaglypts (thumbprints), which are more commonly seen on iron meteorites. This 249-gram complete individual displays faint This stone meteorite was found many years after theįall and it has begun to oxidize, though traces of the original black fusionĬrust are still evident. Gao-Guenie: An attractive example of the ordinary chondrite Gao-Guenie which fell inīurkina Faso in 1960.
Meteorite stone license#
So, one might use a little artistic license and say that our planet is living, in addition to being unique in the Solar System. With the enormous tectonic plates that make up the Earth's crust moving, causing earthquakes and volcanic eruptions, the ground we stand upon is constantly changing. In addition many of the sedimentary rocks that make up the Earth's crust are rich in fossils-the remains of ancient life forms-but so far no fossil record of life on other planets has been discovered. Our planet's surface has been shaped and altered by the relentless action of rain, wind, and ice. In geologic terms it is our planet's crust, which a dictionary might define as "the outermost solid layer of a planet or moon." The outer crust of our planet is very different from other bodies in the Solar System, as it is rich in oxygen and water. The landscape that reveals itself to us is, obviously, only the surface of our home planet. Take a pensive look outside the window of your car while you are driving, or better yet, watch the hills, valleys and plains roll by as you travel on-board a train or airplane. This small, complete individual is only 7.4 grams in weight. Unlike most meteorites, eucrites are not rich in iron, and will not adhere Note theĮxceptionally glossy black fusion crust, which is typical of eucrites. InĬompositional terms eucrites are quite similar to basalts found on Earth,Īnd they may have originated on the large asteroid Vesta. Camel Donga is a rare type of achondrite known as a eucrite.
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