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Allan Hills A77025
Basic information Name: Allan Hills A77025
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77025
This meteorite may also be called Allan Hills 77025 (ALH 77025) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 19.4 g
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
NIPR Catalogue:  2000 Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 11372 approved meteorites (plus 22 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 4(1):

Sample No.: ALHA77025

Location: Allan Hills

Field No.: 77122727

Weight (gms): 19.40

Meteorite Type: H5 Chondrite


Physical Description:

Specimen is tabular and rounded. The entire surface is covered with a brownish-black fusion crust. A few small fissures in the crust reveal a medium gray interior. Specimen is moderately weathered and chipped easily. The freshly chipped surface revealed some flecks of fresh metal, however, it is mostly iron oxide stained. Approximate length is 3.0 cm.


Petrographic Description: Brian Mason

This meteorite is similar in texture, mineral composition, and degree of weathering to ALHA77021, which suggests that these two stones may be separate pieces of the same meteorite.

Data from:
  Table 2
  Line 31:
Origin or pseudonym:Main icefield
Mass (g):19.4
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):17
Comments:26Al=54±5; 77021 pairing group
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), 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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