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Allan Hills A78113
Basic information Name: Allan Hills A78113
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78113
This meteorite may also be called Allan Hills 78113 (ALH 78113) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 299 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(2)  (1979)  Aubrite
Meteoritical Bulletin:  MB 76  (1994)  Aubrite
NHM Catalogue:  5th Edition  (2000)  Aubrite
NIPR Catalogue:  2000 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 2(2):
This text was reprinted from AMN 2(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78113

Location: Allan Hills

Field No.: 385

Weight (gms): 298.6

Meteorite Type: Aubrite

 

Physical Description:

This specimen is brecciated. Visible on the exterior surfaces are abundant very large enstatite grains (~2.5 x 2.0 cm) and less numerous dark clasts. Patches of very thin black fusion crust are present on only three of the six surfaces. Half of the B surface has thin yellowish-green weathering discoloration. Very small spots (<1 mm) of iron oxidation are present on 3 surfaces. Overall dimensions of this sample are 8.5 x 6.5 x 3 cm. The cut face shows many large white enstatite clasts. Few of these contain isolated rounded blebs of metal, of which some have oxidation haloes around. Surrounding these white clasts is fine grained dark gray material. In places this material appears as veins, while in other areas it is much larger in diameter.

 

Petrographic Description: Brian Mason

The thin section consists almost entirely of clasts of orthopyroxene up to 2 mm long in a groundmass of comminuted pyroxene. Accessory amounts of sulfides and nickel-iron are present as small grains in the groundmass. The section shows a moderate amount of brown limonitic staining, concentrated around the metal grains. Microprobe analyses show that the pyroxene is an iron-free enstatite (FeO<0.1%) with minor and variable amounts of CaO (0.2 - 0.6, average 0.5%). The meteorite is an aubrite (enstatite achondrite).

Data from:
  MB76
  Table 2
  Line 337:
Origin or pseudonym:Main icefield
Mass (g):298.6
Class:Aub
Weathering grade:A/Be
Fayalite (mol%):0
Ferrosilite (mol%):0
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(2) (1979), 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° 43'S, 159° 40'E)

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