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Allan Hills A78110
Basic information Name: Allan Hills A78110
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78110
This meteorite may also be called Allan Hills 78110 (ALH 78110) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 160.7 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 9639 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.: ALHA78110

Location: Allan Hills No.: 499

Weight (gms): 160.7

Meteorite Type: H5 Chondrite

Physical Description:

All but the B surface of the sample (7.0 x 5.0 x 2.5 cm.) is covered with a thin, patchy, black fusion crust. Small rounded and irregular inclusions are visible through the fusion crust. The B surface of the sample is weathered and stained reddish-brown by iron-oxidation and has two chondrules protruding from the surface. Several fractures penetrate the sample. The matrix of the sample is reddish-brown and has many inclusions and chondrules (as great as 2 mm in diameter) as well as metallic fragments.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging from 0.3-1.4 mm across; a variety of types is present, the commonest being granular olivine and olivine-pyroxene, porphyritic olivine, and fine-grained pyroxene. The groundmass consists largely of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. A considerable amount of brown limonite is present, generally in association with the metal grains. Microprobe analyses give the following compositions: olivine, Fa18; orthopyroxene, Fs16; plagioclase, An13. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 334:
Origin or pseudonym:Main icefield
Mass (g):160.7
Class:H5
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=58±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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