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ALH 84008   contributed by AMN   MetBul Link

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View all entries for   Meteorite (2)   AMN (153)

Fall not observed. Found 1984 in Antarctica.302 grams. 80 x 80 x 60 mm.   Aubrite
Location Map of Antarctic Finds

AMN writes:
Macroscopic Description - Carol Schwarz
This aubrite fragment has a small amount of black fusion crust and more of the yellowish fusion crust(?)remaining on its surface. The specimen is a complex breccia with large clean white clasts, smaller light clasts with dark inclusions, dark blebs (possibly metal), dark clasts, and areas of dark material with light clasts.
Thin Section Description (,3) - 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 (Wo41-44En56-59). 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.

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John Divelbiss

This Month

3 pictures in the Queue
Graham Macleod
 5/15/2016 2:56:28 AM
Love the texture and the crust! Thanks for sharing this with us AMN,
John Divelbiss
 5/14/2016 9:09:17 AM
Superb looking Aubrite with the typical candy-like cream colored crust. Thanks AMN.
 5/14/2016 2:15:03 AM
Warning: Aubrites, and in particular ALH84008, contain oldhamite that smells like rotten eggs. If you cut one, it stinks.

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