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!
				Murchison 00 70.41 gr A very nice complete piece covered of fresh fusion crust ! Price on request SOLD
Murchison 01 7.685 gr Nice fragment with fresh fusion crust and exceptional large grey inclusion ! unpublished ??? SOLD
				Murchison 02 7.190 gr Nice fragment with fusion crust and exceptional large grey inclusion ! unpublished ??? SOLD
Murchison 03 4.244 gr Nice elongated fragment with a tiny patch of fusion crust  SOLD
				Murchison 04 2.046 gr Nice fragment of Murchison SOLD
Murchison 05 1.574 gr Nice elongated fragment  SOLD
				Murchison 06 1.354 gr Nice fragment with a large surface of crust !!! SOLD
Murchison 07 1.032 gr Nice fragment of Murchison SOLD
				Murchison 08 0.712 gr Nice fragment !!! SOLD
Murchison 09 0.672 gr A nice and tiny fragment  SOLD
				Murchison 10 0.842 gr A group of fragments !!! for chemistry ! SOLD