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Allan Hills A78076
Basic information Name: Allan Hills A78076
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78076
This meteorite may also be called Allan Hills 78076 (ALH 78076) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 276 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
NIPR Catalogue:  2000 Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 5854 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78076

Location: Allan Hills

Field No.: 252

Weight (gms): 275.6

Meteorite Type: H6 Chondrite

 

Physical Description:

A thin (< 1 mm. ) black fusion crust covers most of the sample (8.0 x 5.0 x 4.5 cm). Some small areas of the fusion crust have been physically removed and other areas are stained reddish by iron-oxidation. Polygonal fractures are present on the T and N surfaces. In areas where the fusion crust is absent, clasts of 1-2 mm are apparent in the oxidized material. When the sample was cleaved, clasts as much as 3 mm. in diameter were exposed in the grayish matrix material. The sample is friable and only minor amounts of iron-oxidation are apparent surrounding metallic flakes.

 

Petrographic Description: Brian Mason

Chondrules are present, but are poorly defined and tend to merge with the granular groundmass, which consists of olivine and pyroxene, with minor amounts of nickel-iron and troilite, and a little plagioclase. A rounded aggregate of closely packed chromite grains with interstitial plagioclase, possibly a chondrule, was noted. Minor limonitic staining is present, concentrated around, the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs16; plagioclase, An 13. The meteorite is an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 308:
Origin or pseudonym:Main icefield
Mass (g):275.6
Class:H6
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=52±4; NTL=58±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(2) (1980), 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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