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Allan Hills A77015
Basic information Name: Allan Hills A77015
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77015
This meteorite may also be called Allan Hills 77015 (ALH 77015) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 411 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.5
NHM Catalogue:  5th Edition  (2000)  L3.5
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 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.: ALHA77015

Location: Allan Hills

Field No.: 77122945

Weight (gms): 411.1

Meteorite Type: L3 Chondrite

 

Physical Description:

The specimen is angular, 9.0x5.5x5.0 cm. Dark charcoal-brown fusion crust with vitreous luster covers approximately 50% of the sample. The fusion crust is preserved on the S surface, and is partially preserved on the B surface. The remainder of the sample is devoid of fusion crust, however, it is nearly the same color. Many fractures are present in the sample. Both angular lithic fragments and chondrules were observed on the B surface. They range in color from light brown to dark gray. The largest of these clasts is approximately 0.5 cm in length. When the meteorite was cleaved in half, one chip showed a surface with dark matrix and non-weathered metallic flakes, but the remainder of the meteorites' surfaces were very weathered.

 

Petrographic Description: Brian Mason

The section shows a close-packed aggregate of chondrules, 0.2-1.8 mm in diameter, with only a minor amount of fine-grained matrix. Chondrules are mostly olivine and olivine plus polysynthetically-twinned clinopyroxene; transparent pale brown glass is interstitial to olivine and pyroxene grains in some chondrules. Minor subequal amounts of nickel-iron and troilite are present, concentrated in the matrix and at chondrule margins; the nickel-iron grains are extensively corroded and altered to limonite, and thin veins of limonite occur throughout the section Microprobe analyses show a wide range in the composition of olivine (Fa1-Fa21) and pyroxene (Fs4- Fs24); the pyroxene is a low-calcium clinopyroxene (CaO = 0.2-0.5%). This range of composition, together with the presence of glass and twin 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 23:
Origin or pseudonym:Main icefield
Mass (g):411.1
Class:L3.5
Weathering grade:Ce
Fayalite (mol%):1-21
Ferrosilite (mol%):4-24
Comments:26Al=36±4; 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 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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