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Allan Hills 90411
Basic information Name: Allan Hills 90411
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 90411
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 5.84 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 14(2)  (1991)  L3
AMN 15(1)  (1992)  L3.7
Meteoritical Bulletin:  MB 76  (1994)  L3.7
NHM Catalogue:  5th Edition  (2000)  L3.7
MetBase:  v. 7.1  (2006)  L3.7
Recommended:  L3.7    [explanation]

This is 1 of 51 approved meteorites classified as L3.7.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 14(2):

Sample No.: ALH90411

Location: Allan Hills

Field Number: 6609

Dimensions (cm): 28 x 16.5 x 7.5

Weight (g): 5836.5

Meteorite Type: L3 chondrite

 

Macroscopic Description: Robbie Marlow

Exterior is ~90% covered with dull black fusion crust. Evaporite deposit is visible on one exterior surface. Fractures penetrate deeply into the interior in several locations. Interior matrix is light gray and oxidation is scattered throughout. Numerous millimeter-sized chondrules are present.

 

Thin Section (,6) Description: Brian Mason

The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 2.4 mm across, in a matrix of fine-grained olivine and pyroxene with a minor amount of nickel-iron and troilite. Some weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa4-24, mean Fa21 (CV FeO is 34); pyroxene, Fs5-14. The amount of nickel-iron suggests L group, and the variability of olivine and pyroxene compositions type 3, hence the meteorite is classified as an L3 chondrite (estimated L3.6).

 

Data from:
  MB76
  Table 2
  Line 1409:
Origin or pseudonym:Main icefield
Mass (g):5836.5
Class:L3.7
Weathering grade:Be
Fayalite (mol%):4-24
Ferrosilite (mol%):5-14
Comments:NTL=20.5±0.1
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 14(2) (1991), 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° 58' 51"S, 156° 55' 48"E)
Note: the NHM and MetBase coordinates are 75.5 km apart

Statistics:
     This is 1 of 40773 approved meteorites from Antarctica (plus 4570 unapproved names)
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