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Allan Hills 84126
Basic information Name: Allan Hills 84126
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84126
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 41.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  LL3
Meteoritical Bulletin:  MB 76  (1994)  LL3.4
NHM Catalogue:  5th Edition  (2000)  LL3.4
MetBase:  v. 7.1  (2006)  LL3.4
Recommended:  LL3.4    [explanation]

This is 1 of 24 approved meteorites classified as LL3.4.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 9(3):

Sample No.: ALH84126

Location: Allan Hills

Weight (g): 41.2

Field No.: 2006

Dimensions (cm): 3.5 x 3.5 x 2

Meteorite Type: LL3 Chondrite

 

Macroscopic Description,: Roberta Score

This fragment retains four small patches of fusion crust. The overall exterior color is brown. Numerous chondrule/inclusions show relief on the surface, giving the exterior a rough texture. Weathering has extended deep into the interior. The less weathered material is medium gray with abundant rounded and irregular shaped inclusions.

 

Thin Section (,2) Description: Brian Mason

The section shows a close-packed aggregate of chondrules, chondrule fragments, and angular clasts, ranging up to 3 mm across. Many of the chondrules have dark rims. A variety of chondrule types is present, including porphyritic olivine, granular olivine and olivine-pyroxene, and radiating pyroxene. A few grains of nickel-iron and troilite are present. Olivine and pyroxene have variable compositions. Olivine composition ranges Fa7-31 with a mean of Fa16 (% mean deviation of FeO is 46). Pyroxene composition ranges Fs3-24, with a mean of Fs9 (% mean deviation of FeO is 45). The texture and variable mineral compositions are those of type 3, and the amount of metal suggests LL group, hence the meteorite is tentatively classified as an LL3 chondrite.

Data from:
  MB76
  Table 2
  Line 1091:
Origin or pseudonym:Far Western
Mass (g):41.2
Class:LL3.4
Weathering grade:B
Fayalite (mol%):7-31
Ferrosilite (mol%):3-24
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 53' 40"S, 156° 51' 20"E)
Note: the NHM and MetBase coordinates are 74.3 km apart

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