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Allan Hills 82106
Basic information Name: Allan Hills 82106
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82106
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 35.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  Ureilite
AMN 17(1)  (1994)  Ureilite-augite-bearing
Meteoritical Bulletin:  MB 76  (1994)  Ureilite-augite-bearing
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 510 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 7(2):

Sample No.: ALH82106 & ALH82130

Location: Allan Hills

Field No.: 2914 & 2994

Weight (gms): 35.1 & 44.6 Meteorite Type: Ureilite

 

Physical Description: Roberta Score

Patches of black fusion crust and remnant fusion crust cover much of these fragments. The interior surfaces are nearly black in color with moderate to heavy oxidation present. Well developed crystal faces are obvious. Samples appear to have been shocked. Dimensions: 4.5 x 2.5 x 2.5

 

Petrographic Description: Brian Mason

The section shows an aggregate of anhedral to subhedral grains (0.3-1.8 mm across) of olivine (about 60%) and pyroxene (about 30%), with about 10% of opaque material, in part disseminated throughout and in part concentrated along grain boundaries. Both olivine and pyroxene show undulose extinction; olivine grains are gray from submicroscopic opaque inclusions, where-as pyroxene grains are clear but are extremely fractured. The opaque material along grain boundaries consists of graphite and secondary iron oxides. Microprobe analyses give the following compositions: olivine, somewhat variable, Fa0-Fa5, mean Fa3; pyroxene, essentially uniform, Wo5Fs4En91; a grain of endiopside, Wo36Fs2En62, was analysed. The mineralogy and texture are typical of a ureilite, but the minerals in this meteorite have a higher Mg/Fe ratio than any ureilite so far described.  ALH82130 is essentially identical to ALH82106 in all respects and can confidently be paired with it.

Data from:
  MB76
  Table 2
  Line 845:
Origin or pseudonym:Far Western
Mass (g):35.1
Class:Ur "aug"
Weathering grade:B
Fayalite (mol%):4
Ferrosilite (mol%):4
Comments:26Al=63±4; 82106 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), 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::   (77° 2' 16"S, 157° 15' 6"E)
Note: the NHM and MetBase coordinates are 70.9 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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