CM Group
This group is named for its type specimen, the meteorite of Mighei,
which fell in Ukraine in 1889, and it has many more members than the
previous group. About 80 chondrites of the CM group are known, and they
mostly belong to petrologic type 2, although certain lithologies in some
of its members are known to belong to type 1 (e.g. in Cold Bokkeveld).
With about 10% water, they contain less than the CI chondrites and show
less aqueous alteration so that some chondrules have been well preserved.
Those chondrules consist of olivine and are scattered throughout the black
matrix. In that mixture of phyllosilicate and magnetite, similar to the
matrix of the CI chondrites, one also finds light-coloured inclusions.
These high-temperature silicates are lacking in the CI group.
As with the CI chondrites, the CM chondrites are well known to contain
a wealth of complex organic compounds. The well-studied meteorite of
Murchison, a CM2 that fell in Australia in 1969, was found to contain more
than 230 different amino acids, whereas on earth only 20 different amino
acids are known and used as fundamental building blocks of life. Some of
these extraterrestrial amino acids were found to exhibit strange isotopic
signatures that might indicate that they don't have their origin within
our solar system. These amino acids are believed to represent actual
interstellar matter from other systems and nebulae that were trapped in
this meteorite more than 4.5 billion years ago.
Murchison
Sept. 28, 1969, Australia
100 kg
CM2
Witnessed fall!
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Murchison 00 70.41 gr A very nice complete piece covered of fresh
fusion crust ! Price
on request
SOLD
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Murchison 01 7.685 gr Nice
fragment with fresh
fusion crust and exceptional large grey inclusion ! unpublished ??? SOLD
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Murchison 02 7.190 gr Nice
fragment with
fusion crust and exceptional large grey inclusion ! unpublished ??? SOLD
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Murchison 03 4.244 gr Nice
elongated fragment with a tiny patch of fusion crust SOLD
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Murchison 04 2.046 gr Nice
fragment of Murchison SOLD
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Murchison 05 1.574 gr Nice
elongated fragment
SOLD
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Murchison 06 1.354 gr Nice
fragment with a large surface of crust !!! SOLD
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Murchison 07 1.032 gr Nice
fragment of Murchison SOLD
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Murchison 08 0.712 gr Nice
fragment !!! SOLD
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Murchison 09 0.672 gr A
nice and tiny fragment
SOLD
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Murchison 10 0.842 gr A group
of fragments !!! for chemistry ! SOLD
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