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Martian Meteorites | Lunar Rocks | HED Group | PAC Group | Carbonaceous Chondrites | Rare Chondrites Last Updated: 7 May 2018

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.

Acfer 331

Found 2001 in Tamanghasset, Algeria

TKW 750 gr

CM2

 

Acfer331 -00

large fragment of this rare CM2

4.090gr

SOLD

Acfer331 -01

nice fragment

0.670gr

SOLD

Acfer331 -02

fragment

0.776gr

SOLD

Acfer331 -03

flat fragment

0.742gr

SOLD

Acfer331 -04

multiple broken fragments

0.224gr

SOLD

 

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