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MacAlpine Hills 87300
Basic information Name: MacAlpine Hills 87300
     This is an OFFICIAL meteorite name.
Abbreviation: MAC 87300
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 167.5 g
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  C2
AMN 17(1)  (1994)  C2-ung
Meteoritical Bulletin:  MB 76  (1994)  C2-ung
NHM Catalogue:  5th Edition  (2000)  C3.1-ung
MetBase:  v. 7.1  (2006)  C2-ung
Recommended:  C2-ung    [explanation]

This is 1 of 25 approved meteorites classified as C2-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and Ungrouped chondrites
Comments: Field number: 4624
Writeup from AMN 11(2):

Sample No.: MAC87300; 87301

Location: MacAlpine Hills

Weight (g): 167.5; 110.9

Field No.: 4624; 4608

Dimensions (cm): 6x5.5x3.5; 5.5x5x3.5

Meteorite Type: C2 Chondrite


Macroscopic Description: Cecilia Satterwhite

About 40-50% of the exterior of these fragments is covered with dull black fusion crust. Interior is dark black to gray with many white inclusions. One large dark-red clast (1 cm) is conspicuous on both of these samples.


Thin Section (87300,2; 87301,7) Description: Brian Mason

These sections are so similar in all respects that these meteorites are almost certainly paired. Chondrules are abundant but small (up to 0.6 mm across) and, together with chondrule fragments and mineral grains, are set in a dark brown to black matrix. Chondrules consist of granular or porphyritic olivine and olivine-pyroxene; mineral grains are mainly olivine. Microprobe analyses show that most of the olivine is near Mg2SiO4 in composition, but a few iron-rich grains were analyzed; mean composition is Fa7 . Pyroxene composition ranges from Fs1 to Fs9. The meteorites are C2 chondrites.

Data from:
  Table 2
  Line 4627:
Mass (g):167.5
Class:C2 ung
Weathering grade:B
Fayalite (mol%):0-52
Ferrosilite (mol%):1-8
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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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     Catalogue of Meteorites:   (84° 13'S, 160° 30'E)
     Recommended::   (84° 19' 57"S, 159° 39' 22"E)
Note: the NHM and recommended coordinates are 16 km apart

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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