Sample No.: ALHA77296

Location: Allan Hills

Field No.: 78010211B

Weight (gms): 963.3

Meteorite Type: L6 Chondrite

Physical Description:

Remnants of fusion crust are present on the N surface of this angular specimen. The crust is a dull, orangish-brown, covers approximately 15% of the sample and is 1 mm thick. The B surface appears to have had the fusion crust removed; it is smoother than the remaining surfaces, which are fracture surfaces. The matrix is light gray and has iron oxidation associated with the included metallic particles. Both chondrules and lithic clasts, darker and lighter than the matrix material, are present. On the W surface, there is a subrounded, gray clast that is more than 1 cm in length. The specimen is 13.0 x 9.5 x 5.0 cm.  In the field photographs of this sample, another specimen (ALHA77292) is also present, thus, perhaps, indicating that they are a paired fall.

Petrographic Description:

The section shows sparse and ill-defined chondrules set in a granular matrix of olivine and orthopyroxene, with minor amounts of nickel-iron, troilite, and untwinned plagioclase. A small amount of limonitic staining is associated with the metal grains. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs21), and plagioclase (An11) of uniform composition. The meteorite is classified as an L6 chondrite.