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Allan Hills A78104
Basic information Name: Allan Hills A78104
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78104
This meteorite may also be called Allan Hills 78104 (ALH 78104) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 672 g
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
NIPR Catalogue:  2000 Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 12583 approved meteorites (plus 8 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
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.: ALHA78104

Location: Allan Hills

Field No.: 241

Weight (gms): 672.4

Meteorite Type: L6 Chondrite


Physical Description:

The W surface of the meteorite is partially covered with black fusion crust, which is weathering away. The remainder of the specimen is rough on a centimeter scale, and is weathered and stained by iron-oxidation. A large clast, ~7 mm., is present on the N surface, and a smaller clast, ~3 mm., that appears metallic, is present on the T surface. A number of smaller clasts, which appear to be metallic, are scattered over the surface of the specimen. When the specimen was cleaved during processing, a light gray matrix with metal particles was exposed. An area ~l cm. x 3 cm. in the matrix is a darker gray. A weathering rind, ~5 mm. deep, occurs along some exterior margins.


Petrographic Description: Brian Mason

Chondrules are sparse and have diffuse margins which tend to merge with the granular matrix, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, some plagioclase, and accessory chromite. Minor limonitic staining is present around nickel-iron grains. Well-preserved fusion crust, 0.5 mm thick, is present along one edge. Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs20, plagioclase, An10 The meteorite is an L6 chondrite.

ALHA78104 is an L6 chondrite similar to ALHA78103 in all respects.

Data from:
  Table 2
  Line 328:
Origin or pseudonym:Main icefield
Mass (g):672.4
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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