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MacAlpine Hills 02453
Basic information Name: MacAlpine Hills 02453
     This is an OFFICIAL meteorite name.
Abbreviation: MAC 02453
Observed fall: No
Year found: 2002
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 410 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 28(1)  (2005)  CK5
Meteoritical Bulletin:  MB 89  (2005)  CK5
MetBase:  v. 7.1  (2006)  CK5
Antarctic Meteorite Newsletter:  AMN 34(2)  (2011)  LL6
AMN 36(1)  (2013)  LL6
Recommended:  LL5    [explanation]

This is 1 of 3148 approved meteorites classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Field number: 14227
Revised 10 Sep 2011: Reclassified in AMN 34(2); Again 36(1)
Writeuphelp
Writeup from AMN 28(1):
Sample Number MAC 02453
Newsletter 28,1
Location MacAlpine Hills
Field Number 14227
Dimensions 8.0 x 6.0 x 3.5
Weight 410.4
Original Classification CK5 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 32; Ferrosilite (mol%): 26
Weathering
A
Fracturing
A
Macroscopic Description - Kathleen McBride
The exterior has a no fusion crust and has a greenish tint. The gray crystalline interior has large gray crystals and small black and white inclusions. This carbonaceous chondrite was very hard.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy
The section consists of large (up to 2 mm) chondrules in a matrix of granoblastic silicates, sulfides and magnetite. Weathering is minor. Silicates are homogeneous. Olivine is Fa32 and orthopyroxene is Fs26. The meteorite is a CK5 chondrite.
Antarctic Meteorite Images for Sample MAC 02453
Lab Photo of Sample MAC 02453 Showing Splits  Lab Photo of Sample MAC 02453 Showing North View  Lab Photo of Sample MAC 02453 Showing South View 

Writeup from AMN 34(2):
Correction: Reclassification of MacAlpine Hills 02453 (LL6):

MAC 02453 was classified as a CK5 chondrite in AMN 28(1), reported in MetBull 89. New data by J.T. Wasson and A.E. Rubin (UCLA) show that it is actually an ordinary chondrite (LL6). Bulk composition by INAA: Na 6.1, K 0.97, Ca 12.9, Cr 3.50, Mn 2.59, Fe 177, Ni 8.3 (all mg/g); Sc 8.31, Co 450, Zn 50, Ga 5.0, As 1.35, Se 8.0 (all μg/g); Ru 550, Sb 79, La 318, Sm 195, Eu 79, Yb 197, Os 347, Ir 320 (all ng/g). Contains plagioclase >50 μm in size, chromite, troilite and pentlandite. Magnetite is not present, as originally reported. The published mineral compositions, Fa32 and Fs26, and bulk composition are all consistent with an LL classification.

Writeup from AMN 36(1):

MacAlpine Hills 02453 (MAC 02453)    

Antarctica

Found: 2002

Classification: Ordinary chondrite (LL5)

History: reclassification (announced vol. 28, no. 1): This sample was originally classified as a CK5 chondrite, but chemical analyses reveal that it is very close in composition (Zn/Mn vs. Al/Mn) to many other LL chondrites (Isa, M. et al., 2011, LPSC abstract #1876). This information, together with the observation that there is metal present and no magnetite, has led us to reclassify this sample as an LL5 chondrite.

Data from:
  MB89
  Table A1
  Line 256:
Origin or pseudonym:Bottom Lip
Mass (g):410.4
Class:CK5
Weathering grade:A
Fayalite (mol%):32
Ferrosilite (mol%):26
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 28(1) (2005), JSC, Houston
Published in Antarctic Meteorite Newsletter 34(2) (2011), JSC, Houston
Published in Antarctic Meteorite Newsletter 36(1) (2013), JSC, Houston
Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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Photos:
CreditPhotos
Photographs from AMN:
Photograph from unknown source A photo is in the write-up above
Geography:

Antarctica
Coordinates:
     Recommended::   (84° 19' 24"S, 159° 28' 23"E)

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