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Allan Hills 85151
Basic information Name: Allan Hills 85151
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85151
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 13.9 g
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  C4
AMN 13(3)  (1990)  Chondrite-unique
AMN 17(1)  (1994)  Carlisle Lakes-like
Meteoritical Bulletin:  MB 76  (1994)  R
NHM Catalogue:  5th Edition  (2000)  R
MetBase:  v. 7.1  (2006)  R3.6
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  R3.6
Recommended:  R3.6    [explanation]

This is 1 of 4 approved meteorites classified as R3.6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Writeup from AMN 10(2):

Sample No.: ALH85151

Location: Allan Hills

Weight (g): 13.9

Field No.: 2623

Dimensions (cm): 3 x 3 x 1.5

Meteorite Type: C4 Chondrite


Macroscopic Description: Roberta Score

A small amount of dull black fusion crust remains on this stone. The exterior surface is dull brownish-gray and is heavily pitted. Chondrules and clasts show relief on the surface. One notable clast is black with small white inclusions. The interior is medium-gray in color with white inclusions. Oxidation is extensive in some areas.


Thin Section (,3) Description: Brian Mason

The section shows numerous chondrules (up to 1.2 mm across) and chondrule fragments in a finely granular matrix. Most of the Chondrules consist of granular or porphyritic olivine; pyroxene is rare. Minor amounts of nickel-iron and sulfide are present, mainly as very small grains scattered through the matrix. Microprobe analyses show olivine compositions ranging from Fa0.4 to Fa41, with a mean of Fa34. Pyroxene compositions range from Fs6 to Fs30. The meteorite is classified as a C4 chondrite.

Data from:
  Table 2
  Line 1379:
Origin or pseudonym:Far North
Mass (g):13.9
Weathering grade:B
Fayalite (mol%):0.4-41
Ferrosilite (mol%):6-30
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), 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 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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