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Larkman Nunatak 06877
Basic information Name: Larkman Nunatak 06877
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 06877
Observed fall: No
Year found: 2006
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 588 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(2)  (2007)  IIIAB
Meteoritical Bulletin:  MB 104  (2015)  Iron, IVA
Antarctic Meteorite Newsletter:  AMN 39(1)  (2016)  Iron, IVA
Recommended:  Iron, IVA    [explanation]

This is 1 of 80 approved meteorites (plus 1 unapproved name) classified as Iron, IVA.   [show all]
Search for other: Iron meteorites, IVA irons, and Metal-rich meteorites
Comments: Approved 31 Aug 2007
Revised 27 Feb 2016: Reclassified in AMN 39(1)
Writeuphelp
Writeup from AMN 30(2):
Sample No.: LAR 06877
Location: Larkman Nunatak
Field No.: 19048
Dimensions (cm):   7.0 x 6.0 x 3.0
Weight (g): 588.2
Meteorite Type:

Iron-IIIAB



Macroscopic Description: Tim McCoy
The meteorite has a brown surface indicative of oxidation. It exhibits a strongly convex upper surface typical of flight oriented specimens. On one end of the meteorite, the upper surface contacts a planar lower surface along a distinct terminal ridge. This planar lower surface measures ~5 x 3 cm and terminates along an irregular boundary. The remainder of the lower surface appears to be a later fracture surface, although that fracture likely occurred in the atmosphere judging from the smoothed nature and oxidized surface. On both the upper and lower broken surface, sets of parallel lines are observed, almost certainly reflecting the Widmanstätten pattern of this meteorite.

Thin Section (,2) Description: Tim McCoy
A longitudinal, lenticular-shaped slice measuring ~6 x 2.5 cm was examined prior to thin section preparation. The meteorite exhibits a continuous Widmanstätten pattern with long, thin (~0.5 mm width) kamacite lamellae. In polished section, the convex upper surface is observed to be bounded by a 100-200 µm fusion crust. A reheated α2 structure penetrates ~1 mm around the entire periphery of the sample. Kamacite lamellae range between ~300 and 500 µm in width and triangular to rectangular plessite fields reach 2 mm in width. A single 2 mm troilite inclusion contains an ~100 ?m chromite grain and is bounded by a similarly-sized schreibersite. A microprobe traverse across the section yielded 8.7 wt% Ni, 0.17 wt.% P and 0.51 wt.% Co, within the range for IIIAB irons (Yang and Goldstein, 2005, MAPS 40, 239). The meteorite is an iron, probably of group IIIAB.



Thin Section Images

Reflected Light
LAR 06877
LAR06877 - Reflected Light



Lab Images

LAR 06877


Writeup from AMN 39(1):

Reclassification of LAR 06877


LAR 06877 was announced as a IIIAB iron in Antarctic Meteorite Newsletter vol. 30, no. 2 (August 2007). Subsequent analysis by John Wasson indicates the need for a reclassification. The INAA analyses of 4.07 mg/g Co, 88.3 mg/g Ni, 2.24 μg/g Ga, 10.5 μg/g As, 0.40 μg/g W, 0.83 μg/g Ir and 1.98 μg/g Au demonstrate that LAR06877 is in fact a IVA iron.
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 30(2) (2007), JSC, Houston
Published in Antarctic Meteorite Newsletter 39(1) (2016), JSC, Houston
Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photographs from AMN:
JSC A photo is in the write-up above
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)

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