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Allan Hills A81260
Basic information Name: Allan Hills A81260
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81260
This meteorite may also be called Allan Hills 81260 (ALH 81260) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 124.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  E6
AMN 17(1)  (1994)  EL6
Meteoritical Bulletin:  MB 76  (1994)  EL6
NHM Catalogue:  5th Edition  (2000)  EL6
MetBase:  v. 7.1  (2006)  EL6
Recommended:  EL6    [explanation]

This is 1 of 116 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: ALHA81260

Location: Allan Hills

Weight (g): 124.1

Field No.: 1432

Dimensions (cm): 4.5 x 5 x 3

Meteorite Type: E6 Chondrite

 

Macroscopic Description: Roberta Score

Weathered fusion crust covers approximately 80% of this meteorite fragment. The one fracture surface has a deep reddish-brown color. Evaporite deposit is abundant immediately beneath the fusion crust and occurs in minute quantities on the exterior surfaces. The stone is extremely hard to break. The interior matrix has an overall bluish-black color. Under the binocular microscope crystal faces are visible.

 

Thin Section (,3) Description: Brian Mason

Only vague traces of chondritic structure are visible in the section which consists largely of granular enstatite, with considerable nickel-iron (approximately 20%) and minor amounts of sulfides and plagioclase. Remnants of fusion crust are present. Weathering is minor, with a little limonitic staining around some metal grains. Microprobe analyses show the enstatite is almost pure MgSiO3 (CaO 0.8%, FeO 0.2%, Al2O3, TiO2, MnO 0.1%); plagioclase is somewhat variable in composition, An13-19. The meteorite is an E6 chondrite; the only other E6 chondrite from the Allan Hills, ALHA81021, is similar but appears to be more weathered. The possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 782:
Origin or pseudonym:Middle Western
Mass (g):124.1
Class:EL6
Weathering grade:A/Be
Ferrosilite (mol%):0.3
Comments:26Al=33±2; 81021 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(1) (1985), 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' 20"S, 158° 10' 59"E)
Note: the NHM and MetBase coordinates are 39.7 km apart

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