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Allan Hills A77183
Basic information Name: Allan Hills A77183
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77183
This meteorite may also be called Allan Hills 77183 (ALH 77183) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 288 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
NIPR Catalogue:  2000 Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 5857 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77183

Location: Allan Hills

Field No.: Y78010314

Weight (gms): 288.0

Meteorite Type: H6 Chondrite

 

Physical Description:

This is a well rounded specimen, with the exception of the B surface which is flat. No fusion crust is present on the sample, and all surfaces are stained uniformly reddish-brown. Outlines of small inclusions are visible on the T surface. No unweathered material was observed when the stone was cleaved.

 

Petrographic Description: Brian Mason

Some well-defined chondrules are present, but most of the section consists of a granular aggregate of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron, and troilite. A little limonite is present, usually in association with the nickel-iron. Microprobe analyses show olivine (Fa19), orthopyroxene (Fs16), and plagioclase (An11) of uniform composition. The meteorite is classified as an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 147:
Origin or pseudonym:Main icefield
Mass (g):288
Class:H6
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):16
Comments:26Al=38±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), 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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