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Allan Hills A81316
Basic information Name: Allan Hills A81316
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81316
This meteorite may also be called Allan Hills 81316 (ALH 81316) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  LL4
Meteoritical Bulletin:  MB 76  (1994)  LL4
NHM Catalogue:  5th Edition  (2000)  LL4
MetBase:  v. 7.1  (2006)  LL4
Recommended:  LL4    [explanation]

This is 1 of 360 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 9(1):

Sample No.: ALHA81316

Location: Allan Hills

Weight (g): 0.7

Field No.: 1647

Dimensions (cm): 1 x 1 x 0.5

Meteorite Type: LL4 Chondrite

 

Macroscopic Description: Carol Schwarz

Stone was originally grouped in the field with seven other fragments that comprise ALHA81047. This individual fragment has a different classification from the other fragment that was classified and has been renumbered ALHA81316. This specimen is gray and contains small chondrules.

 

Thin Section (,1) Description: Brian Mason

The small section (0.5 x 1.2 cm) shows a few relatively large chondrules (up to 3.6 mm across) in a finely granular groundmass consisting largely of olivine and pyroxene, with a small amount of nickel-iron and sulfide. Some of the pyroxene is polysynthetically twinned clinobronzite. A little brown limonite is present, but otherwise the meteorite appears relatively unweathered. Microprobe analyses give the following compositions: olivine, Fa29; pyroxene, Fs23. The meteorite is classified as an LL4 chondrite.

Data from:
  MB76
  Table 2
  Line 837:
Origin or pseudonym:Near Western
Mass (g):0.7
Class:LL4
Weathering grade:B
Fayalite (mol%):29
Ferrosilite (mol%):23
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(1) (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° 42' 38"S, 158° 47' 6"E)
Note: the NHM and MetBase coordinates are 22.6 km apart

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