|Allan Hills A81098|
|Basic information||Name: Allan Hills A81098|
This is an OFFICIAL meteorite name.
This meteorite may also be called Allan Hills 81098 (ALH 81098) in publications.
Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 70.9 g
This is 1 of 4 approved meteorites classified as Mesosiderite-B1. [show all]
Search for other: Class B mesosiderites, Metal-rich meteorites, and Mesosiderites
Writeup from AMN 6(2):
Sample No.: ALHA81098
Location: Allan Hills
Field No.: 1311
Weight (gms): 70.9
Meteorite Type: Mesosiderite
Physical Description: Carol Schwarz
The two pieces making up this specimen are fractured and reddish brown with remnant fusion crust. Several brownish mineral grains are present on the surface of the larger piece. The interior is dark red-brown. Dimensions: 4 x 4 x 1.5 cm; 4 x 3.5 x 1 cm
Petrographic Description: Brian Mason
The section consists largely of orthopyroxene, as angular clasts up to 2.5 mm across, in a matrix of comminuted material; the matrix also contains a little plagioclase. About 20% of nickel-iron is present but is extensively weathered to brown limonite. Chromite is a common accessory, in grains up to 1.5 mm across, and a little troilite is present. Microprobe analyses give orthopyroxene composition Fs28 ; with mean weight per CaO 1.1, MnO 0.8, Al2O3 0.6 TiO2 0.3; plagioclase composition is An87. The meteorite is a mesosiderite, very similar to ALHA81059, with which it may be paired.
|References:||Published in Antarctic Meteorite Newsletter 6(2) (1983), JSC, Houston|
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
This is 1 of 35143 approved meteorites from Antarctica (plus 6184 unapproved names)
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