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Allan Hills 83018
Basic information Name: Allan Hills 83018
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83018
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  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 117 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 10(2):

Sample No.: ALH83018

Location: Allan Hills

Weight (g): 3.7

Field No.: 2139

Dimensions (cm): 2.5 x 1.7 x 4

Meteorite Type: E6 Chondrite

 

Macroscopic Description: Carol Schwarz

This flat meteorite fragment has weathered fusion crust on the top and a weathered fracture surface on the bottom. The interior is dark and weathered. Metal is abundant.

 

Thin Section (,2) Description: Brian Mason

Chondritic structure is barely discernable in the section, which consists largely of granular and prismatic enstatite (grains averaging 0.15 mm), with considerable nickel-iron, minor troilite and plagioclase, and traces of sinoite (Si2N20, recognized by its high birefringence). Considerable weathering is indicated by areas of brown limonite and limonitic staining throughout the section. Fusion crust is present along one edge. Microprobe analyses show that the enstatite is almost pure MgSiO3 (FeO 0.1-0.2, CaO 0.7-0.8%); plagioclase is An14Or4; the nickel-iron contains 1.2% Si. The meteorite is an E6 chondrite, very similar to ALH81021 in all respects.

Data from:
  MB76
  Table 2
  Line 901:
Origin or pseudonym:Middle Western
Mass (g):3.7
Class:EL6
Weathering grade:B/C
Ferrosilite (mol%):0
Comments:81021 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), 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° 14' 32"E)
Note: the NHM and MetBase coordinates are 38.3 km apart

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