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Allan Hills A77294
Basic information Name: Allan Hills A77294
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77294
This meteorite may also be called Allan Hills 77294 (ALH 77294) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1351 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9646 approved meteorites (plus 16 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)
Writeuphelp
Writeup from AMN 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77294

Location: Allan Hills

Field No.: B78010901

Weight (gms): 1351.3

Meteorite Type H5 Chondrite

 

Physical Description:

Polygonally fractured, dull, brownish-black fusion crust, approximately 1 mm thick, covers all surfaces of the meteorite (~13:5 x 9.0 x 6.0 cm), with the exception of the edges, which appear to have been spalled. White material, presumably evaporates, fill the grooves of the polygonal fractures on the B surface. This surface is more severely weathered than the other surfaces as evidenced by rounded areas of oxidation staining. The matrix of the stone is whitish-gray with areas of orangish-brown oxidation stain. Chondrules and irregular inclusions (lithic fragments?), as much as 2 mm in diameter, that are both lighter and darker than the matrix are apparent throughout the sample. After sixty hours of drying in the nitrogen cabinet, a crystalline (salt?) de-posit was noted on the corner of the W, B, and S surfaces. When the stone was cut in half no weathering rind was visible. Approximately 15% of the sawed surface appears to be metallic particles.

 

Petrographic Description: Brian Mason

The section shows well-developed chondritic structure, with individual chondrules ranging from 0.6-1.8 mm in diameter. The chondrules are set in a granular groundmass consisting largely of olivine and orthopyroxene, with some nickel-iron and a lesser amount of troilite. A small amount of limonite staining is present around the nickel-iron grains. Microprobe analyses show olivine (Fa17) and pyroxene (Fs15) of uniform composition. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 244:
Origin or pseudonym:Manhaul Bay
Mass (g):1351
Class:H5
Weathering grade:Ae
Fayalite (mol%):17
Ferrosilite (mol%):15
Comments:26Al=63±2; NTL=4.8±0.1
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(1) (1979), 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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