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MacAlpine Hills 88177
Basic information Name: MacAlpine Hills 88177
     This is an OFFICIAL meteorite name.
Abbreviation: MAC 88177
Observed fall: No
Year found: 1988
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 35.3 g
Antarctic Meteorite Newsletter:  AMN 13(2)  (1990)  Ureilite
AMN 14(2)  (1991)  Lodranite
Meteoritical Bulletin:  MB 76  (1994)  Lodranite
NHM Catalogue:  5th Edition  (2000)  Lodranite
MetBase:  v. 7.1  (2006)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 89 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Field number: 5740
Writeup from AMN 13(2):

Sample No. MAC88177

Location: MacAlpine Hills

Dimensions (cm): 4.2x3x1.5

Field Number: 5740

Weight (g): 35.3

Meteorite Type: Ureilite


Macroscopic Description: Roberta Score

MAC88177 is a dome-shaped stone covered with flow-marked black and gray fusion crust on the top and frothy fusion crust on the bottom. The interior of the stone is heavily oxidized and much of it is orange. The less weathered matrix is buff colored. Several thin black veins criss-cross the interior.


Thin Section (,3) Description: Brian Mason

The section shows an equigranular aggregate of anhedral to subhedral olivine and pyroxene (grains 0.3-0.6 mm across), with minor troilite and accessory amounts of nickel-iron and chromite. Shock effects include undulose extinction in the silicate grains, mosaic structure in troilite, and minor veining. Some weathering is indicated by small areas of brown limonite and limonitic staining along veins. Microprobe analyses show olivine and pyroxene of uniform composition: olivine, Fa13; pyroxene, Wo4Fs12. The meteorite is classified as a ureilite, but it lacks the carbonaceous material characteristic of ureilites, and the olivine contains less than 0.1 % Ca and Cr.

Data from:
  Table 2
  Line 4725:
Mass (g):35.3
Weathering grade:B/C
Fayalite (mol%):13
Ferrosilite (mol%):12
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References: Published in Antarctic Meteorite Newsletter 13(2) (1990), 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' 20"S, 159° 32' 46"E)
Note: the NHM and recommended coordinates are 15.9 km apart

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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