Sample No.: ALH84033

Location: Allan Hills

Weight (g): 60.4

Field No.: 2810

Dimensions (cm): 5 x 4 x 2 (largest)

Meteorite Type: C2 Chondrite

Macroscopic Description: Carol Schwarz

This specimen consists of one large rounded piece with several small areas of fusion crust; two smaller pieces, and many <1 cm chips. The matrix is black with some lighter colored 1 mm sized chondrules/clasts and numerous small clasts. Some salt deposit has formed.

Thin Section (,5) Description: Glenn MacPherson

Unlike ALH83100 and its many paired kin, this specimen is a pristine example of a C2 carbonaceous chondrite that contains abundant preserved primary phases. Chondrules up to nearly 2 mm in diameter, abundant and varied inclusion types, crystals, and crystal fragments are dispersed in a black matrix that is reddish brown on thin edges. Olivine is uniformly Fa0-1 among the grains analyzed. Two pyroxene grains were encountered that have an average composition of Wo2En96Fs2. Troilite, pentlandite, Ni-Fe metal, chromite, and magnetite(?) are accessory phases. Many refractory inclusions are present, containing spinel, perovskite and, in a few cases, blue-pleochroic hibonite. Some of the inclusions are unusually large for a C2 meteorite, up to 0.6 mm. This meteorite shows little or no evidence of terrestrial weathering.