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Allan Hills 84028
Basic information Name: Allan Hills 84028
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84028
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 736 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(2)  (1985)  CV3
Meteoritical Bulletin:  MB 76  (1994)  CV3
NHM Catalogue:  5th Edition  (2000)  CV3
MetBase:  v. 7.1  (2006)  CV3
Recommended:  CV3    [explanation]

This is 1 of 511 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Writeuphelp
Writeup from AMN 8(2):

Sample No:ALH84028

Location: Allan Hills

Weight (g) 735.9

Field No.: 2850

Dimensions (cm): 9 x 8 x 6.5

Meteorite Type: C3V Chondrite

 

Macroscopic Description: Carol Schwarz

Bubbly black fusion crust covers about 50% of this rounded specimen. Without fusion crust the sample is dark with lighter inclusions. Some salt deposit has formed. The interior is gray with numerous 1-2 mm lighter inclusions and a few oxidation haloes.

 

Thin Section (,4) Description: Glenn MacPherson

This specimen shows no obvious evidence of terrestrial weathering. A variety of chondrules up to about 2 mm in diameter, clasts, and inclusions up to about 4 mm in maximum dimension are distributed throughout a pristine matrix consisting of (at least) abundant minute olivine plates of Fa45-50 composition, troilite, and awaruite. The chondrules are very well preserved, and many contain devitrified glass. The olivine in chondrules, and larger matrix grains, have a wide range of composition, from Fa0-30, but most are Fa0-10. Pyroxene grains having a composition close to Wo1 En97 Fs2 were found, although a wide range of compositions like that of olivine is presumably present. Fine-grained and coarse-grained refractory inclusions are present, including one large one (a Type A, irregular in shape) that contains gehlenitic melilite, spinel, and very titanium-rich fassaitic pyroxene. This is a beautiful example of a C3V carbonaceous chondrite.

Data from:
  MB76
  Table 2
  Line 993:
Origin or pseudonym:Near Western
Mass (g):735.9
Class:CV3
Weathering grade:Ae
Fayalite (mol%):0-50
Ferrosilite (mol%):2
Comments:26Al=43±3; 84028 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 8(2) (1985), 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° 46' 14"S, 158° 53' 32"E)
Note: the NHM and MetBase coordinates are 20.7 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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