header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 14 Oct 2020
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Allan Hills 84120
Basic information Name: Allan Hills 84120
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84120
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 129 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(1)  (1987)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.8
NHM Catalogue:  5th Edition  (2000)  L3.8
MetBase:  v. 7.1  (2006)  L3.8
Recommended:  L3.8    [explanation]

This is 1 of 68 approved meteorites classified as L3.8.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 10(1):

Sample No.: ALH84120

Location: Allan Hills

Weight (g): 129.0

Field No.: 1545

Dimensions (cm): 4x4.5x3

Meteorite Type: L3 Chondrite

 

Macroscopic Description: Roberta Score

Thirty percent of ALH84120 is covered with fusion crust. Areas devoid of fusion crust have a brownish-gray color. The interior of this unequilibrated chondrite is medium-gray in color and contains numerous light and dark gray rounded and irregular shaped inclusions. Oxidation is light and mainly appears as haloes around metal grains.

 

Thin Section (,3) Description: Brian Mason

The section shows an aggregate of chondrules (0.3-1.8 mm across) and chondrule fragments in a fine-grained matrix of olivine and pyroxene with minor amounts of nickel-iron and troilite. A variety of chondrule types is present; a barred chondrule has transparent pale brown glass between the olivine bars. Most of the pyroxene is polysynthetically twinned clinobronzite. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses show most olivine of fairly uniform composition, averaging Fa22, but with a few more magnesian grains (CV FeO is 8). Pyroxene composition is more variable, Fs6-21. The meteorite is classified as an L3 chondrite, probably L3.8-3.9.

Data from:
  MB76
  Table 2
  Line 1085:
Origin or pseudonym:Far Western
Mass (g):129
Class:L3.8
Weathering grade:A/B
Fayalite (mol%):22
Ferrosilite (mol%):6-21
Comments:26Al=69±6
Catalogs:
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(1) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 54' 18"S, 156° 56' 25"E)
Note: the NHM and MetBase coordinates are 72.6 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page