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Allan Hills A77215
Basic information Name: Allan Hills A77215
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77215
This meteorite may also be called Allan Hills 77215 (ALH 77215) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 820 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  L4
AMN 4(1)  (1981)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
NIPR Catalogue:  2000 Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.8
Recommended:  L3.8    [explanation]

This is 1 of 68 approved meteorites classified as L3.8.   [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.: ALHA77215

Location: Allan Hills

Field No.: 77122946

Weight (gms): 819.6

Meteorite Type: L3 Chondrite

 

Physical Description:

The surface of this specimen is mostly weathered surface, however a small remnant of the fusion crust remains. The E, W, and N surfaces are fracture surfaces that contain numerous chondrules and lithic clasts. The largest chondrule is approximately 0.5 cm in diameter. Both the chondrules and lithic clasts are commonly lighter color than the surrounding gray matrix. The fractures that are not covered with weathering rind range from greenish-brown to reddish brown. There are numerous fractures over the meteorite's surface. The sample is approximately 13.0 x 7.0 x 7.0 cm. The sample closely resembles ALHA77216, ALHA77217 and ALHA77252.

 

Petrographic Description: Brian Mason

The thin section shows well-developed chondritic structure, with a variety of chondrule types; chondrules range from 0.3 - 1.8 mm in diameter. The chondrules are set in a granular groundmass consisting largely of olivine and pyroxene (some grains polysynthetically twinned), with minor nickel-iron and troilite in approximately equal amounts. A minor amount of limonitic staining is present. Microprobe analyses show some variability in olivine and pyroxene compositions: olivine, Fa22-Fa26, average Fa23; pyroxene, Fs9-Fs21, average Fs15. The meteorite is classified as an L3 chondrite.

Data from:
  MB76
  Table 2
  Line 171:
Origin or pseudonym:Main icefield
Mass (g):819.6
Class:L3
Weathering grade:B
Fayalite (mol%):22-26
Ferrosilite (mol%):9-21
Comments:26Al=36±4; 77216 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 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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