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Allan Hills A77010
Basic information Name: Allan Hills A77010
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77010
This meteorite may also be called Allan Hills 77010 (ALH 77010) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 296 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  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 5782 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)
Writeuphelp
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77010

Location: Allan Hills

Field No.: 77122939

Weight (gms): 295.8

Meteorite Type: H4 Chondrite

 

Physical Description:

The exterior of the specimen is nearly a uniform reddish-brown. However, a small amount of thin, black fusion crust is present on the E surface. Several rounded (chondrules) and angular (lithic clasts) inclusions are apparent on the sawed surfaces. The inclusions are lighter in color than the reddish-brown, iron oxide stained matrix material. Dimensions: 7.0x5.0x5.0 cm.

 

Petrographic Description: Brian Mason

Chondrules are prominent and well developed, 0.2-1.5 mm in diameter; a variety of types is present, the commonest being porphyritic olivine, granular olivine-pyroxene, and fine-grained pyroxene. Pyroxene grains in the olivine-pyroxene chondrules are polysynthetically twinned clinobronzite. The groundmass consists of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. The section shows a considerable degree of weathering in the form of small areas and veinlets of brown limonite. Microprobe analyses show olivine of essentially uniform composition (Fa18) and pyroxene of somewhat variable composition (Fs15-Fs18, average Fs16). The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 18:
Origin or pseudonym:Main icefield
Mass (g):295.8
Class:H4
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):15-18
Comments:26Al=49±3
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(1) (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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