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Allan Hills A78102
Basic information Name: Allan Hills A78102
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78102
This meteorite may also be called Allan Hills 78102 (ALH 78102) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 337 g
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
NIPR Catalogue:  2000 Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10950 approved meteorites (plus 20 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78102

Location: Allan Hills

Field No.: 494

Weight (gms): 336.9

Meteorite Type: H5 Chondrite


Physical Description:

A large proportion of the exterior of this 9.0 x 6.0 x 6.0 cm sample is weathered and stained by iron oxidation and spotted with small patches of black fusion crust. Except for the inner most material, this sample is totally weathered. The light matrix material of the inner most material is spotted with iron-oxidation and contains many small (as great as 3 mm. in maximum diameter) dark clasts.


Petrographic Description: Brian Mason

Chondritic structure is fairly prominent, but the margins of the chondrules are frequently ill-defined and tend to merge with the granular groundmass, which consists of olivine and pyroxene with minor amounts of nickel-iron and troilite. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs17. The meteorite is an H5 chondrite.

Data from:
  Table 2
  Line 326:
Origin or pseudonym:Main icefield
Mass (g):336.9
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:26Al=35±3; NTL=23.4±0.4
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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