MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 3 Sep 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
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
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 130 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
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:
  Table 2
  Line 901:
Origin or pseudonym:Middle Western
Mass (g):3.7
Weathering grade:B/C
Ferrosilite (mol%):0
Comments:81021 pairing group
Search for specimens in the Smithsonian Institution collection (U.S.):   
    Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 10(2) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
Find references in NASA ADS:
Find references in Google Scholar:

     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

     This is 1 of 43857 approved meteorites from Antarctica (plus 3802 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page