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Allan Hills 84007 | |||||||||||||||||||||
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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: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 78 approved meteorites classified as Aubrite. [show all] Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites | ||||||||||||||||||||
Writeup![]() |
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: |
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Plots: | O isotopes: | ||||||||||||||||||||
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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:![]() |
Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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