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Allan Hills A78153
Basic information Name: Allan Hills A78153
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78153
This meteorite may also be called Allan Hills 78153 (ALH 78153) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 151.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  LL6
Meteoritical Bulletin:  MB 76  (1994)  LL6
NHM Catalogue:  5th Edition  (2000)  LL6
NIPR Catalogue:  2000 Edition  (2000)  LL6
MetBase:  v. 7.1  (2006)  LL6
Recommended:  LL6    [explanation]

This is 1 of 2751 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 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78153

Location: Allan Hills

Field No.: 492

Weight (gms): 151.7

Meteorite Type: LL6 Chondrite

 

Physical Description:

Fusion crust is present on the N, B and portions of the E surfaces. The fusion crust is thick (1-2 mm.) and dull brownish-black, and has a blistery texture. Many polygonal fractures are present. A weathering rind (as great as 5 mm thick is present in some areas. The fracture surfaces are dark brown in isolated areas, but the overall color is greenish-yellow. It appears that some large clasts have been plucked from the exterior surfaces of the sample. The sample shows an unusual weathering pattern. Veins of dark reddish-brown are adjacent to areas of yellowish material. Also areas of less severely weathered matrix material, which is gray, was exposed during processing of the sample. No clasts or chondrules are discernible.

 

Petrographic Description: Brian Mason

Chondritic structure is barely discernible the section showing a rather uniform granular aggregate of olivine and pyroxene with minor amounts of troilite and plagioclase, a little nickel-iron, and accessory chromite. A little limonitic staining is present in association with the metal grains. Microprobe analyses give the following composition: olivine, Fa29; orthopyroxene, Fs24; plagioclase, An11; and a single grain of diopside, Wo46En45Fs9. The meteorite is classified as an LL6 chondrite.

Data from:
  MB76
  Table 2
  Line 372:
Origin or pseudonym:Main icefield
Mass (g):151.7
Class:LL6
Weathering grade:B/C
Fayalite (mol%):29
Ferrosilite (mol%):24
Comments:26Al=22±1; 78153 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(2) (1980), 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'S, 159° 40'E)

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