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MacKay Glacier 05231
Basic information Name: MacKay Glacier 05231
     This is an OFFICIAL meteorite name.
Abbreviation: MCY 05231
Observed fall: No
Year found: 2005
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 6.2 g
Antarctic Meteorite Newsletter:  AMN 29(2)  (2006)  CM1-2
Meteoritical Bulletin:  MB 92  (2007)  CM1-2
Recommended:  CM1/2    [explanation]

This is 1 of 26 approved meteorites classified as CM1/2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), CM chondrites, and CM-CO clan chondrites
Comments: Approved 1 Sep 2006
Revised 30 May 2009: Change to CM1/2 from 1-2: not described as a breccia
Writeup from AMN 29(2):
Sample No.: MCY 05231; MCY 05234
Location: MacKay Glacier
Field No.: 17332; 13694
Dimensions (cm):   3.0x1.0x1.25; 1.25x0.75x0.5
Weight (g): 6.158; 0.795
Meteorite Type: CM1-2 Chondrite

Macroscopic Description: Kathleen McBride
The exteriors have some purplish black fusion crust with polygonal fractures. The interiors have a soft black matrix with light colored chondrules/inclusions.

Thin Section (,2) Description: Tim McCoy and Emma Bullock
The sections consist of rare small chondrules and individual silicates in a highly-altered matrix. Olivine compositions are Fa0-33, pyroxene is Fs1-40. The matrix consists pre-dominantly of an Fe-rich serpentine. The meteorites are CM1-2 chondrites.

Thin Section Images

Cross-Polarized Light
MCY 05231
Plane-Polarized Light
MCY 05231
Reflected Light
MCY 05231
MCY 05231 - Cross-Polarized Light MCY 05231 - Plane-Polarized Light MCY 05231 - Reflected Light
Cross-Polarized Light
MCY 05234
Plane-Polarized Light
MCY 05234
Reflected Light
MCY 05234
<a href=MCY 05234 - Cross-Polarized Light"> <a href=MCY 05234 - Plane-Polarized Light"> <a href=MCY 05234 - Reflected Light">

Lab Images

MCY 05231 and 05234 Image North

Data from:
  Table 3
  Line 693:
Mass (g):6.2
Weathering grade:B
Fayalite (mol%):0-33
Ferrosilite (mol%):1-40
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 29(2) (2006), JSC, Houston
Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photographs from AMN:
JSC A photo is in the write-up above


     This is 1 of 43499 approved meteorites from Antarctica (plus 3802 unapproved names)

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