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MacAlpine Hills 87302
Basic information Name: MacAlpine Hills 87302
     This is an OFFICIAL meteorite name.
Abbreviation: MAC 87302
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1095 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  L4
Meteoritical Bulletin:  MB 76  (1994)  L4
NHM Catalogue:  5th Edition  (2000)  L4
MetBase:  v. 7.1  (2006)  L4
Recommended:  L4    [explanation]

This is 1 of 1652 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Field number: 4384
Writeuphelp
Writeup from AMN 11(2):

Sample No.: MAC87302; 87303

Location: MacAlpine Hills

Weight (g): 1094.6; 254.2

Field No.: 4384; 4392

Dimensions (cm): 10x8x8; 7x6x4

Meteorite Type: L4 Chondrite

 

Macroscopic Description: René Martinez

MAC87302 is rounded and 87303 is angular and these do not fit together, but macroscopically these two rocks are identical. Matrix is light-gray and inclusions are mostly light-colored. Some of the larger clasts are angular and appear to be clasts of ordinary chondrite material. The rest are clearly chondrules. There are small pockets of sulfide about 3-5 mm across as well as smaller grains disseminated throughout.

 

Thin Section (87302,13; 87303,10) Description: Brian Mason

These sections are very similar in all respects and the meteorites are almost certainly paired. Chondrules and chondrule fragments are abundant, up to 2.4 mm across, but their margins tend to merge with the finely granular matrix, which consists of olivine and pyroxene with minor amounts of nickel-iron and troilite. Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs20. The meteorites are L4 chondrites.

Data from:
  MB76
  Table 2
  Line 4629:
Mass (g):1094.6
Class:L4
Weathering grade:A/B
Fayalite (mol%):24
Ferrosilite (mol%):20
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (1988), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 13'S, 160° 30'E)
     Recommended::   (84° 17' 11"S, 160° 9' 14"E)
Note: the NHM and recommended coordinates are 8.7 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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