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MacAlpine Hills 87320
Basic information Name: MacAlpine Hills 87320
     This is an OFFICIAL meteorite name.
Abbreviation: MAC 87320
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 16.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 12(1)  (1989)  C2
AMN 13(3)  (1990)  CR2
Meteoritical Bulletin:  MB 76  (1994)  CR2
NHM Catalogue:  5th Edition  (2000)  CR2
MetBase:  v. 7.1  (2006)  CR2
Recommended:  CR2    [explanation]

This is 1 of 167 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Field number: 4651
Writeuphelp
Writeup from AMN 12(1):

Sample No.: MAC87320

Location: MacAlpine Hills

Weight(g): 16.2

Field No.: 4651

Dimensions (cm): 3x2.5x1.3

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Carol Schwarz

The meteorite is covered by reddish-black weathered, polygonally fractured fusion crust. A small amount of salt is visible. The interior is black with white and rusty clasts/chondrules plainly visible.

 

Thin, Section, (,2) Description: Brian Mason

The small section consists almost entirely of large chondrules, up to 4 mm across, in a dark matrix which contains abundant metal grains, concentrated on chondrule margins; only a small amount of sulfide is present. Most of the chondrules are of granular olivine and polysynthetically twinned clino-enstatite; one small melilite-spinel inclusion was noted. The matrix appears to consist largely of phyllosilicates. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa1-30, mean Fa6; pyroxene, Fs1-7. The meteorite is tentatively classified as an unusual C2 chondrite; it resembles Renazzo in texture and in the abundance of metal.

Data from:
  MB76
  Table 2
  Line 4647:
Mass (g):16.2
Class:CR2
Weathering grade:Be
Fayalite (mol%):1-30
Ferrosilite (mol%):1-7
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 12(1) (1989), 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° 16' 38"S, 159° 38' 49"E)
Note: the NHM and recommended coordinates are 11.7 km apart

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