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Allan Hills 84136
Basic information Name: Allan Hills 84136
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84136
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 83.5 g
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  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 649 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeup from AMN 9(3):

Sample No.: ALH84136

Location: Allan Hills

Weight (g): 83.5

Field No.: 1527

Dimensions (cm): 6.5 x 3 x 3.5

Meteorite Type: Ureilite


Macroscopic Description: René Martinez

Flaky black fusion crust entirely covers this specimen. The interior is dark gray and granular with crystals as large as 2 mm in a red-brown matrix. Stone is very coherent.


Thin Section (,3) Description: Brian Mason

The section shows an aggregate of anhedral to subhedral grains (0.6-2.4 mm across) of olivine and pyroxene, with about 10% of opaque material, in part disseminated throughout and in part concentrated along grain boundaries. Olivine grains are gray from submicroscopic opaque inclusions, whereas pyroxene grains are clear but are extremely fractured. Well-preserved fusion crust is present on one edge. Microprobe analyses give the following compositions: olivine, somewhat variable, Fa0-5, mean Fa3; pyroxene, essentially uniform, Wo5Fs4; one grain of endiopside, Wo34Fs2.5, was analysed. The mineralogy and texture are typical of a ureilite; this specimen is so similar in all respects to ALH82106 and 82130 that it can be confidently paired with them.

Data from:
  Table 2
  Line 1101:
Origin or pseudonym:Far Western
Mass (g):83.5
Class:Ur "aug"
Weathering grade:B
Fayalite (mol%):3
Ferrosilite (mol%):4
Comments:26Al=77±7; 82106 pairing group
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References: Published in Antarctic Meteorite Newsletter 9(3) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (77° 2' 23"S, 157° 8' 52"E)
Note: the NHM and MetBase coordinates are 73.3 km apart

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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