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Allan Hills A78106
Basic information Name: Allan Hills A78106
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78106
This meteorite may also be called Allan Hills 78106 (ALH 78106) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 465 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.: ALHA78106

Location: Allan Hills

Field No.: 400

Weight (gms): 464.5

Meteorite Type: L6 Chondrite


Physical Description:

Ice was noted on the sample when removed from the freezer. This semi-pyramidal shaped specimen appears to be unweathered. It is completely covered with a spotted brown, black, polygonally fractured, ~1 mm thick fusion crust. Shallow regmaglypts are present on all surfaces. A small portion ~2 cm. x 1 cm., of fusion crust was broken off the W surface, revealing a nonweathered, light gray matrix with dark and light clasts, as much as 1 mm in diameter. When the meteorite was cleaved in half during processing, abundant unoxidized metal was observed. Light and dark clasts, as much as 2 mm. in diameter, were present in the light gray matrix.


Petrographic Description: Brian Mason

Chondrules are sparse an• poorly defined, tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. Well-developed fusion crust, 0.6 mm thick, rims one edge of the section. The meteorite appears to be completely unweathered, being free of limonitic staining (a recent fall?). Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs20; Plagioclase, An11. The meteorite is an L6 chondrite.

Data from:
  Table 2
  Line 330:
Origin or pseudonym:Main icefield
Mass (g):464.5
Weathering grade:A/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 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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