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MacKay Glacier 12002
Basic information Name: MacKay Glacier 12002
     This is an OFFICIAL meteorite name.
Abbreviation: MCY 12002
Observed fall: No
Year found: 2013
Country: Antarctica [Collected by Programma Nazionale di Ricerche in Antartide (PNRA), Italy]
Mass:help 42.6 g
Recommended:  CM2    [explanation]

This is 1 of 626 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 30 Jul 2023
Writeup from MB 112:

MacKay Glacier 12002 (MCY 12002)        77° 14.4667’ S, 158° 2.2167’ E

Antarctica, Antarctica

Find: 2013 Jan 03

Classification: Carbonaceous chondrite (CM2)

History: A dark stony fragment (7 cm across) was recovered from the MacKay Glacier ice field, Antarctica, during the 2012-2013 Italian Programma Nazionale delle Ricerche in Antartide (PNRA) meteorite search campaign

Physical characteristics: Dark stony fragment (7 cm across) with partially preserved fusion crust. The total mass of the sample is 42.6 g.

Petrography: The investigated section (about 2 cm2) is composed of 20 vol.% chondrules, 15 vol.% PCP and <1 vol.% CAIs, embedded in a fine-grained matrix (65 vol.%). Calcium carbonate (1.5 vol.%), sulfides (0.8 vol.%) and FeNi blebs (0.14 vol.%) and are also present within the matrix. Chondrule mean diameter is 480±270 µm and chondrules are mainly IA and IB POP types, with scarce CC, BO and IIA chondrule types. Mesostases in porphyritic chondrules are altered to hydrous mineral phases, but neighboring phenocrysts are unaffected. There is no evidence of brecciation, but few chondrules appear fragmented. There is no evidence of limonite surrounding Fe-Ni metal, but just a mild staining noticeable under transmitted light, which confers to this meteorite a weathering grade W0.

Geochemistry: Chemical analyses where conducted using the EPMA at NHMV), Austria using 15 kV of acceleration voltage and beam current of 20 nA. In both cases, ZAF correction was applied and natural and synthetic minerals were used as reference material. Olivine is mainly Fo100, although some type IIA chondrules contain olivine with composition Fo11. Both low-Ca and high-Ca pyroxenes are Fe-poor: En97.6±0.9Fs1.3±0.7Wo1.1±0.8; En68.2±11.8Fs1.4±0.8Wo33.5±11.6. Sulphides are stoichiometric troilite and pentlandite. PCPs have a Fe/SiO2 ratio of 1.52.

Classification: Carbonaceous chondrite (CM2). Low shock and weathering grade.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:MacKay Glacier
Date:2013 Jan 03
Latitude:77° 14.4667' S
Longitude:158° 2.2167' E
Mass (g):42.6
Shock stage:S1
Weathering grade:W0
Fayalite (mol%):34±34 (N=40)
Ferrosilite (mol%):1.3±0.7
Wollastonite (mol%):1.1±0.8
Magnetic suscept.:3.83
Classifier:S. I. Lelarge, M. del Rio, M. Masotta, L. Folco, DST-PI
Type spec mass (g):42.6
Type spec location:MNA-SI
Main mass:MNA-SI
Comments:Submitted by Stefano Iannini Lelarge (DST-PI)
   and collections
DST-PI: Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy (institutional address; updated 17 Oct 2011)
MNA-SI: Museo Nazionale dell'Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy; Website (institutional address; updated 13 Dec 2011)
NHMV: Naturhistorisches Museum, Burgring 7, 1010 Wien, Austria, Austria; Website (institutional address; updated 18 Jan 2019)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Public domain photographs:
Stefano Iannini Lelarge         

     Recommended::   (77° 14' 28"S, 158° 2' 13"E)

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