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Allan Hills A77167
Basic information Name: Allan Hills A77167
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77167
This meteorite may also be called Allan Hills 77167 (ALH 77167) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 611 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.4
NHM Catalogue:  5th Edition  (2000)  L3.4
NIPR Catalogue:  2000 Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.4
Recommended:  L3.4    [explanation]

This is 1 of 51 approved meteorites classified as L3.4.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
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.: ALHA77167

Location: Allan Hills

Field No.: 77123029

Weight (gms): 611.2

Meteorite Type: L3 Chondrite

 

Physical Description:

This is an angular specimen approximately 12.5x8.0x6.0 cm, and is weathered very dark reddish brown. It appears that the S surface has small remnants of fusion crust, while the other surfaces are broken surfaces. Fractures are present on the N, S and B surfaces. Snow was present in a prominent fracture when the sample was removed from cold storage. Some light colored angular clasts and chondrules, up to as much as 0.5 cm, are apparent through the weathering rind. Many small holes are randomly distributed over the exterior of the stone, presumably due to the weathering out of lithic clasts and chondrules. When the sample was cleaved it broke into many pieces, none of which exposed fresh, non-weathered material.

 

Petrographic Description: Brian Mason

The thin section shows a close-packed-aggregate of chondrules and chondrule fragments, with a minimal amount of dark fine-grained matrix. The chondrules range from 0.2-1.5 mm in diameter, and show a variety of types, the commonest being granular olivine, olivine-pyroxene, and fine-grained pyroxene (sometimes radiating). The pyroxene is polysynthetically-twinned clinopyroxene. The granular chondrules contain intergranular glass usually turbid and partly devitrified, but occasionally transparent and pale violet in color. Minor amounts of nickel-iron and troilite are present, often concentrated on the surface of chondrules.. The meteorite is extensively weathered with brown limonitic staining pervading the section and numerous veins and small patches of limonite throughout. Microprobe analyses show a wide range in the composition of olivine (Fa2-Fa41) and pyroxene (Fs3-Fs17); the pyroxene is low-calcium, CaO=0.2-0.5%. This range of composition, together with the presence of glass and twinned clinopyroxene, indicates type 3, and the small amount of nickel-iron suggests L group, the meteorite is therefore tentatively classed as an L3 chondrite.

Data from:
  MB76
  Table 2
  Line 134:
Origin or pseudonym:Main icefield
Mass (g):611.2
Class:L3.4
Weathering grade:C
Fayalite (mol%):2-41
Ferrosilite (mol%):3-17
Comments:26Al=37±2; 77011 pairing group
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 40719 approved meteorites from Antarctica (plus 4494 unapproved names)
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