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Allan Hills A81098
Basic information Name: Allan Hills A81098
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81098
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:help 70.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  Mesosiderite
Meteoritical Bulletin:  MB 76  (1994)  Mesosiderite
NHM Catalogue:  5th Edition  (2000)  Mesosiderite
MetBase:  v. 7.1  (2006)  Mesosiderite-B1
Recommended:  Mesosiderite-B1    [explanation]

This is 1 of 4 approved meteorites classified as Mesosiderite-B1.   [show all]
Search for other: Class B mesosiderites, Metal-rich meteorites, and Mesosiderites
Writeuphelp
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.

Data from:
  MB76
  Table 2
  Line 621:
Origin or pseudonym:Near Western
Mass (g):70.9
Class:Meso
Weathering grade:C
Ferrosilite (mol%):28
Comments:77219 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(2) (1983), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 42' 53"S, 158° 44' 41"E)
Note: the NHM and MetBase coordinates are 23.7 km apart

Statistics:
     This is 1 of 33406 approved meteorites from Antarctica (plus 6798 unapproved names)
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