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Haberer-Meteorites Gifts of the sky |
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Stony-meteorites
Chondrites
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Chondrites are the oldest known matter. These meteorites developed simultaneously with our central star, the Sun, by crystalizing out in the presolar primeval nebula in form of ball-like spezies, the so-called chondrules. These chondrules condensed together with other presolar matterl to smaller and larger rocks and remained the following 4,5 billions years more or less unchanged. Chemically the Chondrites resemble the Sun if one refrains from the missing of all fleeting elements as well as helium and hydrogen. But according to the place, in which the respective Chondrites crystalized out in the presolar primeval nebula they are significantly different, thus numerous groups and clans are distinguished, which further below are described individually. Next to the separation in clans and groups, Chondrites are generally distinguished according to so-called petrological classes, a scale of 1 to 7 that gives information about the differentiation degree of the individual Chondrites. The classes 1 and 2 occur only in Carbonaceous Chondrites and designate meteorites with sparse, little chondrules in which a change took place through oxidising and water. The class 3 designates meteorites with large, clear chondrules that remained almost unchanged while the classes 4 to 6 designate Chondrites, that increasingly got heated in their history and hereby were changed. The chondrules with higher petrological degree become more and more undifferentiated and fuse with the matrix. The class 7 finally comprises meteorites whose chondric nature becomes clear only through their chemical compound. They contain no more chondrules and form a kind of transition to the Achondrites. |
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