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Allan Hills A77217
Basic information Name: Allan Hills A77217
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77217
This meteorite may also be called Allan Hills 77217 (ALH 77217) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 413 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
Recommended:  L3    [explanation]

This is 1 of 676 approved meteorites classified as L3.   [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.: ALHA77217

Location: Allan Hills

Field No.: 77122948

Weight (gms): 413.2

Meteorite Type: L3 Chondrite

 

Physical Description:

This stone is approximately 9.5 x 7.0 x 4.5 cm. Fusion crust (~1 mm thick) covers approximately 20% of the sample. The remaining surfaces are covered with iron oxide stain. The S surface is only lightly stained, presumably this is the most recently exposed surface. The broken surfaces show distinct clasts, ranging from white to dark gray, as much as 1.5 cm in length. The stone is extremely heterogeneous on a centimeter scale. This is very similar in appearance to ALHA77216, ALHA77215, and ALHA77252.

 

Petrographic Description: Brian Mason

The thin section shows moderately abundant chondrules set in a granular groundmass consisting largely of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite. Much of the pyroxene, especially in the chondrules, is poly-synthetically twinned clinopyroxene. A little limonitic staining is present around nickel-iron grains. Microprobe analyses show some variability in olivine and pyroxene compositions: olivine, Fa17-Fa26, average Fa22; pyroxene Fs9-Fs26, average Fs17. The meteorite is classified as an L3 chondrite.

Data from:
  MB76
  Table 2
  Line 173:
Origin or pseudonym:Main icefield
Mass (g):413.2
Class:L3
Weathering grade:B
Fayalite (mol%):17-25
Ferrosilite (mol%):9-26
Comments:26Al=38±3; 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 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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