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Larkman Nunatak 06876
Basic information Name: Larkman Nunatak 06876
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 06876
Observed fall: No
Year found: 2006
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 475 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(2)  (2007)  IAB
Recommended:  Iron, IAB complex    [explanation]

This is 1 of 68 approved meteorites (plus 1 unapproved name) classified as Iron, IAB complex.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 31 Aug 2007
Writeuphelp
Writeup from AMN 30(2):
Sample No.: LAR 06876
Location: Larkman Nunatak
Field No.: 19352
Dimensions (cm):   8.0 x 5.5 x 3.5
Weight (g): 475.3
Meteorite Type:

Iron-IAB



Macroscopic Description: Tim McCoy
The meteorite is a somewhat irregularly shaped mass of ~8 x 5.5 x 3.5 cm. One surface is relatively smooth, with numerous small (1-2 mm) pits and large (1-2 cm) and occasional larger (~5 mm diameter), shallow pits. The opposite surface is highly-irregular in shape, with larger (~5 mm) deep pits.

Thin Section (,2) Description: Tim McCoy
A longitudinal slice measuring ~5 x 2.5 cm was examined prior to thin section preparation. The slice exhibits a prominent reheated α2 structure around the entire margin, reaching to a depth of up to 3 mm. The section includes inclusions of troilite, silicates and likely graphite that reach up to 1.5 cm in maximum dimension. The meteorite exhibits a Widmanstätten pattern indicative of formation from a single austenite crystal and with kamacite bandwidths of ~1.5-2 mm. Examination of the polished thin section reveals polyminerallic inclusions of olivine (Fa5), low-Ca pyroxene (Fs6), high-Ca pyroxene (Fs3), plagioclase, metal, troilite, graphite, schreibersite and rare chromite. No fusion crust or heat-altered zone was present. The metallic host contains poorly-defined, short kamacite lamellae that exceed 0.5 mm in width. A microprobe traverse revealed an average composition of 7.8 wt.% Ni, 0.06 wt.% P and 0.57 wt.% Co. The low P value likely reflects the exsolution of schreibersite. The meteorite in an iron, probably of group IAB.



Thin Section Images

Reflected Light
LAR 06876
LAR06876 - Reflected LightLAR06876 - Reflected LightLAR06876 - Reflected LightLAR06876 - Reflected Light



Lab Images

LAR 06876

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 Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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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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