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Achondrite Meteorites are stone meteorites that have no chondrules. This lack of chondrule may be the result of melting or because the meteorites formed on a planetary body. Lunar and Martian meteorites are most often catalogued as Achondrite meteorites. Some Achondrite meteorites are believed to have originated on the asteroid Vesta and are grouped into a family called HED meteorites. These letters stand for Howardite, Eucrite, and Diogenite type Achondrites. The outside appearance of many Achondrites is similar to that of other stony meteorites, however several of the Achondrites have fusion crusts that are strikingly different. Eucrites for example because of their chemistry have a very shiny black fusion crust. Some members of the Achondrite meteorites are a mixture of different chunks of rock in a single specimen. These are referred to as breccias. Words such as polymict breccia and monomict breccia describe whether the angular components of the mix come from a single source or a multiple different group of sources. |
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Hunting Meteorites in Franconia
In late October you may have noticed that we put up a notice on our meteorites-for-sale.com site that we would be out of town for a week. We had not spent more that a day here or there hunting mete... Tektite Shapes Take a large piece of rock moving very fast and slam it into the Earth and you can make a crater, release tremendous energy, and kill everything for miles around. But, you probably will not make tektites. These pecular pieces o... Moon and Mars Meteorites It seems that when the discussion of Martian and Lunar meteorites comes up two questions are always asked. First how do they get to Earth? And secondly, how do you know they are from the Moon or Mars? Most met... |
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