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Allan Hills A81016
Basic information Name: Allan Hills A81016
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81016
This meteorite may also be called Allan Hills 81016 (ALH 81016) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.85 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 11278 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81016

Location: Allan Hills

Field No.: 1635

Weight (gms): 3850.2

Meteorite Type: L6 Chondrite

 

Physical Description: Carol Schwarz

This specimen has a thin, patchy, remnant fusion crust. Most of the sample is smooth and has weathered to a dark reddish-brown color. Distinct chondrules up to ~4 mm in diameter are visible as well as some large mineral grains. A small amount of white deposit has formed along the hair-line fractures. The interior is a lighter brown-green color. No chondrules are distinguishable. However, a large (~4 mm) mineral grain with distinct cleavage faces was exposed. Dimensions: 15 x 12 x 11 cm.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, merging with the granular ground-mass, which consists largely of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron, and troilite, and accessory chromite. A moderate amount of brown limonitic staining is present along grain boundaries. Microprobe analyses give the following compositions: olivine, Fa5; orthopyroxene, Fs21; plagioclase, An11. The meteorite is an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 539:
Origin or pseudonym:Near Western
Mass (g):3850.2
Class:L6
Weathering grade:Be
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=55±4
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(1) (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° 43' 59"S, 158° 48' 25"E)
Note: the NHM and MetBase coordinates are 22.1 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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