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Allan Hills A78115
Basic information Name: Allan Hills A78115
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78115
This meteorite may also be called Allan Hills 78115 (ALH 78115) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 848 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.: ALHA78115

Location: Allan Hills

Field No.: 294

Weight (gms): 847.6

Meteorite Type: H6 Chondrite

 

Physical Description:

This sample is smooth and rounded. There is scattered fusion crust on the B and E surfaces, and a very small amount on the W surface. The fusion crust is black, thin and pitted. Where the sample is devoid of fusion crust it is smooth and weathered a reddish-brown. Clasts and chondrules, as much as 9 mm. in diameter, are present. It appears that one corner on the N surface has been broken off, but the surface is weathered and stained similar to the remainder of the sample. The interior of the meteorite, exposed during processing, contains metallic particles and is moderately weathered.

 

Petrographic Description: Brian Mason

A few ill-defined chondrules are present. Most of the section shows a granular aggregate consisting largely of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron, and troilite (nickel-iron in excess of troilite). Grains of brown limonite are present throughout the section, and are concentrated below remnants of fusion crust along one edge. Microprobe analyses give the following compositions: olivine Fa18; pyroxene, Fs16; plagioclase, An12. The meteorite is an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 339:
Origin or pseudonym:Main icefield
Mass (g):847.6
Class:H6
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=43±3; NTL=48±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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