Sample No.: ALHA77252

Location: Allan Hills

Field No.: 77122944

Weight (gms): 343.1

Meteorite Type: L3 Chondrite with L6 clasts

Physical Description:

This sample suffered considerable damage during transport from the Antarctic and was noted as consisting of chips and fines on its arrival in California. One piece has dull, black, fusion crust present. The matrix of all pieces is greenish-gray and contains many inclusions, ranging to more than 1 cm in diameter. Many surfaces have an orangish-brown weathering rind.

Petrographic Description: Brian Mason

The chip from which the thin section was made showed a marked division into two parts, the larger dark gray and chondrite, the smaller pale gray and granular. The granular part appears to contain some poorly defined chondrules; in the chondritic part chondrules are numerous and well-defined, sometimes broken and fragmentary. Minor subequal amounts of nickel-iron and troilite are present in both parts. A small amount of limonitic staining is present, concentrated around the metal grains. Microprobe analyses show olivine and pyroxene in the two parts to have essentially identical and uniform compositions: olivine, Fa23, pyroxene, Fs20. Minor plagioclase (An12) was detected in both parts. This meteorite is an L-group chondrite, the chondrite part may be classified L3, the granular part L6.