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Allan Hills A78108
Basic information Name: Allan Hills A78108
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78108
This meteorite may also be called Allan Hills 78108 (ALH 78108) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 172.5 g
Classification
  history:
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)  H3
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9648 approved meteorites (plus 16 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)
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.: ALHA78108

Location: Allan Hills

Field No.: 399

Weight (gms): 172.5

Meteorite Type: H5 Chondrite

 

Physical Description:

Only the T and N surfaces of the specimen (6.0 x 5.5 x 4.0 cm) have remnant patches of fusion crust. The other surfaces of the specimen are fracture surfaces that have been weathered and stained by iron-oxidation. Several fractures are apparent on the exterior of the sample. This sample appears to be severely shocked. During chipping many slickenside surfaces were exposed. The sample is brecciated and two veins of black material (~1 mm wide) with higher relief that the surrounding material, are present in the interior of the stone.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging from 0.3-0.9 mm across. The chondrules are set in a fine-grained matrix which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Brown limonitic staining is present around the metal grains Microprobe analyses give the following compositions: olivine, Fa18; orthopyroxene, Fs16; plagioclase, An 12. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 332:
Origin or pseudonym:Main icefield
Mass (g):172.5
Class:H5
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=55±3
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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