Sample No.: ALH84007

Location: Allan Hills

Weight (g): 705.6

Field No.: 2827

Dimensions (cm): 11 x 7 x 55

Meteorite Type: Aubrite

Macroscopic Description: Carol Schwarz

Thin black to yellowish fusion crust(?) occurs in small areas on some surfaces of this brecciated specimen. Large white clasts, up to several centimeters in longest dimension, smaller white fragments and small dark, roundish inclusions (metal?) make up the interior of ALH84007. Some oxidation was noted.

Thin Section (,3) Description: Glenn MacPherson

ALH84007 is virtually identical to ALH84008 and the two may be paired. Localized staining by iron oxides as haloes around metal grains, indicates mild terrestrial weathering. Large (up to approximately 4 mm) intensely shocked enstatite crystals, (FeO is less than approximately 0.2%) are mostly monoclinic, but orthorhombic ones are present as well. The dusty brown matrix consists of granulated enstatite plus minor forsterite (FeO less than about 0.1%) and diopside (Wo41-44 En56-59). Diopside occurs both as independent grains in the matrix and also as rounded inclusions within enstatite. Sparse, very large (over 3 mm) kamacite grains are present, invariably associated with a complex assemblage of phases that includes (at least) troilite, schreibersite, daubreelite and alabandite. This is an aubrite.