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ALH 85003   contributed by AMN   MetBul Link


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View all entries for   Meteorite (1)   AMN (153)


Fall not observed. Found 1985 in Antarctica.50.1 grams. 4 x 3.5 x 2.5 cm.   CO3.5
Location Map of Antarctic Finds



AMN writes:
1 of only 12 meteorites with this classification.

Macroscopic Description - René Martinez
Thick patchy fusion crust covers approximately 70% of this carbonaceous chondrite. The interior is light gray and chondrules/clasts are not distinguishable in the granular matrix. A 1 mm thick weathering rind and small patches of rust are present.
Thin Section Description (,4) - Brian Mason
The thin section shows an aggregate of small chondrules (up to 0.9 mm diameter, but most are less than 0.6 mm), chondrule fragments, and irregular aggregates set in a translucent yellow-brown matrix. Chondrules are mainly granular or porphyritic olivine. Minor amounts of nickel-iron and sulfide are present, as small grains scattered throughout the section. Microprobe analyses of olivine show a wide composition range, Fa1-56, mean Fa17; only a few grains of pyroxene were found, having a composition range of Fs0.5-23. The meteorite is classified as a C3 chondrite of the Ornans subtype; it is so similar to ALH82101 that the possibility of pairing should be considered.
Reclassification Notes (AMN 31,1)
Reclassified as CO3.5 Chondrite in AMN 31,1.

Reference: D.W.G.Sears et al., 1991, Proc. NIPR Symp. Ant. Met. 4, 319


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Ian Macleod
 9/15/2015 6:52:42 AM
Great Piece! Brian Mason is a famous name, he is also the finder of a 2.207 kg piece of Cockburn L6 by Dr.in July 1973 here in Australia.
Steve Dunklee
 9/14/2015 9:44:08 PM
should have added beautiful! nice chondrules.
Steve Dunklee
 9/14/2015 9:42:21 PM
Hey that looks like the piece of charcoal from my grill I lost. please return it promptly HaHa
John Divelbiss
 9/14/2015 3:37:15 PM
really nice CO....thanks for sharing AMN
 

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