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Allan Hills A79039
Basic information Name: Allan Hills A79039
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79039
This meteorite may also be called Allan Hills 79039 (ALH 79039) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 108.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5782 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)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA79039

Location: Allan Hills

Field No.: 1059

Weight (gms): 108.3

Meteorite Type: H4 Chondrite

 

Physical Description: Roberta Score

The top of this stone is concave while the bottom is flat. ALHA79039 is totally covered with a thin black fusion crust which the bottom surface has a blistery texture. Several fractures penetrate the, interior of this meteorite. The interior material is mainly weathered though areas of light gray clastic material do exist. Dimensions: 6 x 5 x 2.5 cm.

 

Petrographic Description: Brian Mason

Chondrules are abundant and well-developed, ranging from 0.3-1.5 mm in diameter. A variety of types is present, including granular and porphyritic olivine, barred olivine, and fine-grained radiating pyroxene. The groundmass consists largely of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. Some of the pyroxene is polysynthetically-twinned clinobronzite. Brown limonitic staining pervades the section. Fusion crust, up to 1 mm thick, rims part of the section. Microprobe analyses show olivine (Fa16) and pyroxene (Fs15) of essentially uniform composition. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 476:
Origin or pseudonym:Main icefield
Mass (g):108.3
Class:H4
Weathering grade:B
Fayalite (mol%):16
Ferrosilite (mol%):15
Comments:26Al=42±2
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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