Classifying meteorites Some meteorites are more important than others in terms of the information they have provided. The Allende meteor , for example, has been a particularly important find and extensively studied, partly because it is so large, and partly because of its interesting structure. The more it has been studied, though, the more ambiguous have seemed the results from those initially obtained. The Ar 40 dating puts its age at 4.6 Gyr, which places its creation at the very begining of the solar system. It has a number of interesting small objects or inclusions embedded in a background rock composed originally of fine mineral dust. Two types of inclusion are the CAIs (Calcium and Aluminium Inclusions) and "chondrules" of pyroxen and olivine. Conjecturing how these inclusions attained the chemical compositions they have, and how the material formed together, has lead to much debate about the early state of the proto-solar nebula, where itis assumed the Allende meteor formed. One paormed.
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