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.

NWA 4428 Found 2006 in Morocco TKW 138 gr CM2 anomalous paired with NWA 3340 abstract on NWA3340 anomalous CM2
				NWA4428 -00 BIG crusted fragment, the largest available for this rare carbonaceous. 10.45gr SOLD
NWA4428 -01 nice crusted fragment. Crust have bubbling ! 3.65gr SOLD
				NWA4428 -02 big fragment with no crust 4.95gr $950
NWA4428 -03 cut fragment with fusion crust 1.33gr SOLD
				NWA4428 -04 group of fragment, 2 slices and one with fusion crust 3.22gr SOLD
NWA4428 -05 superb fragment with bubbled fusion crust 1.04gr SOLD
				NWA4428 -06 crusted fragment 2.00gr SOLD
NWA4428 -07 sliced fragment, deep black matrix 1.45gr SOLD
				NWA4428 -08 superb fragment with heavely bubbled fusion crust 2.10gr SOLD
NWA4428 -09 group of fragment, 2 sliced and none with fusion crust 3.04gr SOLD
				NWA4428 -10 big fragment with fusion crust 3.40gr SOLD
NWA4428 -11 fragment with nice fusion crust 2.00gr SOLD
				NWA4428 -12 sliced fragment, very nice matrix 1.42gr SOLD