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Allan Hills A78107
Basic information Name: Allan Hills A78107
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78107
This meteorite may also be called Allan Hills 78107 (ALH 78107) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 198.4 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)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9655 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.: ALHA78107

Location: Allan Hills

Field No.: 473

Weight (gms): 198.4

Meteorite Type: H5 Chondrite

 

Physical Description:

The B, S, and portions of the E surfaces are covered with a thin, black polygonally fractured fusion crust, which is slightly stained by iron-oxidation. There are shallow regmaglypts present on the S surface. The remaining surfaces are fracture surfaces and are weathered and stained a reddish-brown. No unweathered material was exposed in the sample during processing.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, chondrules ranging from 0.3-1.2 mm across; a variety of types is present, the commonest being granular olivine and olivine-pyroxene, barred olivine, and fine-grained pyroxene. The chondrules are set in a fine-grained aggregate of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Limonitic staining pervades the section, and occasional patches of red-brown limonite are seen. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs17. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 331:
Origin or pseudonym:Main icefield
Mass (g):198.4
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:26Al=54±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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