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Allan Hills A77160
Basic information Name: Allan Hills A77160
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77160
This meteorite may also be called Allan Hills 77160 (ALH 77160) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 70.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
NIPR Catalogue:  2000 Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
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.: ALHA77160

Location: Allan Hills

Field No.: 77123006

Weight (gms): 70.42

Meteorite Type: L3 Chondrite

 

Physical Description:

Approximately 80% of surface is dark brown and angular with a slight patina. The patina is probably a result of chemical weathering and wind ablation. The remainder of the stone is covered by a spotty, thin, black fusion crust. This is not a complete specimen. The maximum dimension is approximately 5.5 cm. From field photographs it is apparent that the B surface was in contact with the ice.

 

Petrographic Description: Brian Mason

Chondrules abundant, 0.2-2.5 mm diameter, in a minimal amount of dark fine-grained matrix; some chondrules are spherical, but many are elliptical to irregular in form. Chondrules are mainly composed of barred or porphyritic olivine, some with polysynthetically twinned clinopyroxene. Interstitial glass in chondrules is pale gray, transparent to turbid. Minor subequal amounts of troilite and nickel-iron are present, the nickel-iron extensively altered to red-brown limonitic material, which pervades the section along chondrule boundaries. Microprobe analyses show a wide range of olivine composition, Fa3-Fa46, and a similar range in pyroxene composition. This range in composition, together with the presence of glass and twinned clinopyroxene, indicates type 3, and the small amount of nickel-iron suggests L group.

Data from:
  MB76
  Table 2
  Line 127:
Origin or pseudonym:Main icefield
Mass (g):70.4
Class:L3
Weathering grade:C
Fayalite (mol%):3-46
Ferrosilite (mol%):6-40
Comments:26Al=50±7; 77011 pairing group
Catalogs:
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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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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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