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Allan Hills A78126
Basic information Name: Allan Hills A78126
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78126
This meteorite may also be called Allan Hills 78126 (ALH 78126) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 607 g
Classification
  history:
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 10981 approved meteorites (plus 6 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)
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.: ALHA78126

Location: Allan Hills

Field No.: 383

Weight (gms): 606.9

Meteorite Type: L6 Chondrite

 

Physical Description:

The NE corner of this sample (~12 x 8 x 5 cm) has been removed. A thin, ~1 mm, black fusion crust that is polygonally fractured in the B surface, and is weathering to a brown in some areas, covers the remainder of the specimen. Some areas of the fusion crust have weathered away, revealing a partially weathered, yellowish-gray matrix material. Some metallic looking particles are apparent on the broken surface. A deep fracture extends along the T and S faces. During processing of the sample, it became apparent that weathering penetrated the sample as much as 0.5 cm. below the fusion crust. The matrix material exposed during processing is greenish-gray, with several veins of what appears to be darker matrix material penetrating it. Small metallic locking particles were also apparent in this friable sample.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, their borders tending to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of brown limonitic staining is present around the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21; plagioclase, An10. The meteorite is an L6 chondrite. ALHA78130, 78131 are L6 chondrites similar in all respects to ALHA78126.

Data from:
  MB76
  Table 2
  Line 349:
Origin or pseudonym:Main icefield
Mass (g):606.9
Class:L6
Weathering grade:B
Fayalite (mol%):25
Ferrosilite (mol%):21
Comments:26Al=45±3
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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