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Allan Hills 84007
Basic information Name: Allan Hills 84007
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84007
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 706 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(2)  (1985)  Aubrite
Meteoritical Bulletin:  MB 76  (1994)  Aubrite
NHM Catalogue:  5th Edition  (2000)  Aubrite
MetBase:  v. 7.1  (2006)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 63 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 8(2):

Sample No.: ALH84007

Location: Allan Hills

Weight (g): 705.6

Field No.: 2827

Dimensions (cm): 11 x 7 x 55

Meteorite Type: Aubrite

 

Macroscopic Description: Carol Schwarz

Thin black to yellowish fusion crust(?) occurs in small areas on some surfaces of this brecciated specimen. Large white clasts, up to several centimeters in longest dimension, smaller white fragments and small dark, roundish inclusions (metal?) make up the interior of ALH84007. Some oxidation was noted.

 

Thin Section (,3) Description: Glenn MacPherson

ALH84007 is virtually identical to ALH84008 and the two may be paired. Localized staining by iron oxides as haloes around metal grains, indicates mild terrestrial weathering. Large (up to approximately 4 mm) intensely shocked enstatite crystals, (FeO is less than approximately 0.2%) are mostly monoclinic, but orthorhombic ones are present as well. The dusty brown matrix consists of granulated enstatite plus minor forsterite (FeO less than about 0.1%) and diopside (Wo41-44 En56-59). Diopside occurs both as independent grains in the matrix and also as rounded inclusions within enstatite. Sparse, very large (over 3 mm) kamacite grains are present, invariably associated with a complex assemblage of phases that includes (at least) troilite, schreibersite, daubreelite and alabandite. This is an aubrite.

Data from:
  MB76
  Table 2
  Line 973:
Origin or pseudonym:Middle Western
Mass (g):705.6
Class:Aub
Weathering grade:Ae
Fayalite (mol%):0
Ferrosilite (mol%):0
Comments:83009 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(2) (1985), 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° 52' 40"S, 158° 30' 7"E)
Note: the NHM and MetBase coordinates are 34.7 km apart

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