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Allan Hills 90407
Basic information Name: Allan Hills 90407
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 90407
Observed fall: No
Year found: 1990
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(1)  (1992)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM2
Recommended:  CM2    [explanation]

This is 1 of 529 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 15(1):

Sample No.: ALH90407

Location: Allan Hills

Field Number: 6619

Dimensions (cm): 1 x 0.9 x 0.6

Weight (g): 0.6

Meteorite Type: C2 chondrite

 

Macroscopic Description: Cecilia Satterwhite

The exterior of this pea-sized meteorite is dark gray to black and contains one small patch of fusion crust. The interior is medium gray. Abundant light colored inclusions and a few small dark inclusions are visible in the coarse grained matrix.

 

Thin Section (,2) Description: Brian Mason

The section consists almost entirely of black matrix, with sparse chondrules and small scattered grains of olivine. Microprobe analyses show that most of the olivine is near Mg2SiO4 in composition, but some iron-rich grains are present, the range being Fa1-31, mean Fag (CV FeO is 123). The meteorite is a C2 chondrite.

 

Data from:
  MB76
  Table 2
  Line 1408:
Origin or pseudonym:Main icefield
Mass (g):0.6
Class:C2
Weathering grade:B
Fayalite (mol%):1-31
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(1) (1992), 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° 57' 16"S, 156° 56' 15"E)
Note: the NHM and MetBase coordinates are 74.3 km apart

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