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Allan Hills 83070
Basic information Name: Allan Hills 83070
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83070
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 216 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  LL6
Meteoritical Bulletin:  MB 76  (1994)  LL6
NHM Catalogue:  5th Edition  (2000)  LL6
MetBase:  v. 7.1  (2006)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2754 approved meteorites (plus 1 unapproved name) classified as LL6.   [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.: ALH83070

Location: Allan Hills

Weight (g): 215.7

Field No.: 2745

Dimensions (cm): 6 x 4 x 4.5

Meteorite Type: LL6 Chondrite

 

Macroscopic Description: René Martinez

Black fusion crust covers most of this meteorite, except for a fracture surface which has weathered to a pale yellow color with reddish-brown oxidation stains. Weathering has caused the more resistant clasts/chondrules to show relief on this exterior surface. Fresh interior matrix is light gray and fine-grained with no visible oxidation staining. A darker gray weathering rind, discontinuous and thin, was exposed when this specimen was chipped. No metal is visible.

 

Thin Section (,3) Description: Brian Mason

Chondritic structure is barely discernible, the section showing a rather uniform granular aggregate of olivine and pyroxene, with minor amounts of plagioclase and sulfide, a little nickel-iron, and accessory chromite. Microprobe analyses gave the following compositions: olivine, Fa29; pyroxene, Fs23; plagioclase, An10. The meteorite is an LL6 chondrite. In texture and mineral compositions it resembles ALHA78153 and 81123 and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 953:
Origin or pseudonym:Middle Western
Mass (g):215.7
Class:LL6
Weathering grade:A
Fayalite (mol%):29
Ferrosilite (mol%):23
Comments:26Al=62±3; 78153 pairing group
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° 49' 19"S, 158° 7' 50"E)
Note: the NHM and MetBase coordinates are 41 km apart

Statistics:
     This is 1 of 39175 approved meteorites from Antarctica (plus 5051 unapproved names)
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