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Allan Hills A77208
Basic information Name: Allan Hills A77208
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77208
This meteorite may also be called Allan Hills 77208 (ALH 77208) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1733 g
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 6359 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 1(3):
This text was reprinted from AMN 1(3) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77208

Location: Allan Hills

Field No.: 77122904

Weight (gms): 1733.0

Meteorite Type: H4 Chondrite


Physical Description:

The specimen is angular, highly fractured, and severely weathered. No fusion crust remains on the specimen. The fractures appear to penetrate throughout the stone. Numerous inclusions are visible on the brown weathered surfaces. Approximate dimensions: 13.75x10x9 cm. No fresh metal or unweathered surface was exposed when obtaining material for a thin section.


Petrographic Description: Brian Mason

Chondrules are numerous and well-developed, ranging from 0.3 to 0.9 mm in diameter; a variety of types is present, the commonest being granular olivine, porphyritic olivine, and fine-grained or granular pyroxene. Much of the granular pyroxene is polysynthetically twinned clinobronzite. Minor amounts of nickel-iron (~15%) and troilite (~5%) are distributed throughout the groundmass. The meteorite is extensively weathered, with limonite pervading the section and also concentrated in veinlets. Microprobe analyses show olivine (Fa17) and pyroxene (Fs14) of essentially uniform composition. The uniform olivine and pyroxene composition and the presence of clinobronzite indicate that the meteorite should be classified as an H4 chondrite.

Data from:
  Table 2
  Line 165:
Origin or pseudonym:Near Western
Mass (g):1733
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):14
Comments:26Al=52±3; 77004 pairing group
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References: Published in Antarctic Meteorite Newsletter 1(3) (1978), 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 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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