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Allan Hills A77192
Basic information Name: Allan Hills A77192
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77192
This meteorite may also be called Allan Hills 77192 (ALH 77192) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 845 g
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 6388 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
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.: ALHA77192

Location: Allan Hills

Field No.: 77122903

Weight (gms): 845.3

Meteorite Type: H4 Chondrite


Physical Description:

The angular specimen (~9.0x8.0x15.0 cm) is void of fusion crust. The entire stone is weathered reddish-brown, with the exception of a few small areas of gray matrix material that was exposed when the stone was cleaved in half. The severity of the weathering masks any textural characteristics. This is one of the nineteen specimens that Dr. Cassidy believes to be related. The meteorites that have been initially processed and comprise this group are: ALHA77004; 77190; 77191; 77192; and 77233.


Petrographic Description: Brian Mason

The section shows moderately-abundant chondrules, 0.3-0.9 mm in diameter, set in a granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Some of the pyroxene is poly synthetically twinned clinobronzite. Brown limonitic staining pervades the section. Microprobe analyses show olivine with slightly variable composition (Fa16-18, average Fa17) and pyroxene with greater variability (Fs15-21, average Fs16). The meteorite is classified as an H4 chondrite.

Data from:
  Table 2
  Line 155:
Origin or pseudonym:Near Western
Mass (g):845.3
Weathering grade:C
Fayalite (mol%):16-18
Ferrosilite (mol%):15-21
Comments:26Al=55±6; 77004 pairing group
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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