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Allan Hills A77086
Basic information Name: Allan Hills A77086
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77086
This meteorite may also be called Allan Hills 77086 (ALH 77086) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 19.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
NIPR Catalogue:  2000 Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9646 approved meteorites (plus 16 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA77086

Location: Allan Hills

Field No.: 77122759

Weight (gms): 19.44

Meteorite Type: H5 Chondrite

 

Physical Description:

The overall color o the sample is brownish-black and severely weathered. About 30% of the meteorite's surface is covered with remnants of fusion crust. The remainder of the surface represents three fracture faces. From field photographs it appears that the T surface was on the ice. The sample was difficult to chip. The fresh interior surface is not as weathered as the exterior surface. The longest dimension of the sample is approximately 2.5 cm.

 

Petrographic Description: Brian Mason

Chondrules numerous, some well-defined, others irregular in form and tend to merge with the groundmass. They range from 0.3-1.2 mm in diameter, and show a variety of types, the commonest being porphyritic olivine, barred olivine, and radiating or fine-grained pyroxene. Fusion crust is present on one edge. The section is pervaded by yellow-brown limonitic staining, and patches and veinlets of brown limonite are present. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs17) of uniform composition; some small grains of sodic plagioclase were detected.

Data from:
  MB76
  Table 2
  Line 72:
Origin or pseudonym:Main icefield
Mass (g):19.4
Class:H5
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=58±6; 77021 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), 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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