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Allan Hills A78085
Basic information Name: Allan Hills A78085
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78085
This meteorite may also be called Allan Hills 78085 (ALH 78085) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 219 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 9649 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(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.: ALHA78085

Location: Allan Hills

Field No.: 435

Weight (gms): 219.3

Meteorite Type: H5 Chondrite

 

Physical Description:

Only the B surface of the specimen (6.5 x 4.5 x 3.5 cm.) has a very thin, black fusion crust. The remaining surfaces of the sample are fracture surfaces that are weathered and stained a dark reddish-brown. A small clast (~2 mm), that appears to be troilite is present on the T surface. During processing of the meteorite, the brecciated character of the meteorite and the interior light-dark structure was exposed. The light portion of the chondrite exists as numerous clasts in a wide range of sizes. These light colored clasts are surrounded by dark material.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed in parts of the section, but in other parts it is less prominent, possibly as a result of local brecciation. The chondrules are set in a fine-grained granular groundmass which consists largely of olivine and pyroxene, with minor nickel-iron and troilite (nickel-iron in excess of troilite). Brown limonitic staining is present in parts of the section, along with veinlets and patches of red-brown limonite. Microprobe analyses give the following compositions: Olivine, Fa18; orthopyroxene, Fs16; plagioclase, An12. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 316:
Origin or pseudonym:Main icefield
Mass (g):219.3
Class:H5
Weathering grade:Be
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=50±2
Catalogs:
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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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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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