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Allan Hills A78074
Basic information Name: Allan Hills A78074
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78074
This meteorite may also be called Allan Hills 78074 (ALH 78074) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 200 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 12206 approved meteorites (plus 7 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.: ALHA78074

Location: Allan Hills

Field No.: 280

Weight (gms): 200.2

Meteorite Type: L6 Chondrite


Physical Description:

This is not a complete specimen. Shiny fusion crust (1-2mm thick) covers B, W, and portions of S, N, and E surfaces. Polygonal fractures are present on the B and N surfaces. Where fracture surfaces are present they are rough and slightly weathered and stained by iron oxidation. The matrix of the sample is light gray and included clasts and chondrules are darker gray. Some oxidation halos are apparent.


Petrographic Description: Brian Mason

Chondrules are sparse and poorly developed, with margins that tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite and some plagioclase; accessory chromite was noted. Well preserved fusion crust, 0.4 mm thick, is present along one edge of the section. A minor amount of brown limonitic staining occurs immediately below the fusion crust. Microprobe analyses give the following compositions: olivine, Fa24-orthopyroxene, Fs21; plagioclase, An10. The meteorite is classified as an L6 chondrite.

Data from:
  Table 2
  Line 306:
Origin or pseudonym:Main icefield
Mass (g):200.2
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
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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 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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