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Larkman Nunatak 12138
Basic information Name: Larkman Nunatak 12138
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12138
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 184.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 38(1)  (2015)  Iron, IVB
Meteoritical Bulletin:  MB 104  (2015)  Iron, IVB
Recommended:  Iron, IVB    [explanation]

This is 1 of 17 approved meteorites classified as Iron, IVB.   [show all]
Search for other: Iron meteorites, IVB irons, and Metal-rich meteorites
Comments: Approved 12 Feb 2015
Writeuphelp
Writeup from AMN 38(1):
Sample Number LAR 12138
Newsletter 38,1
Location Larkman Nuntak
Field Number 23175
Dimensions 5.0 x 3.0 x 2.5
Weight 184.74
Original Classification Iron-IVB
Macroscopic Description - Cari Corrigan and Tim McCoy
This meteorite is generally rounded with a brown surface that exhibits minor rust haloes. The meteorite also shows deep pits, including some that are elongated, in the bottom of which are what appear to be schreibersite or troilite. On the cut surface opposite that used for classification, are skeletal schreibersites.
Thin Section Description (,2) - Cari Corrigan and Tim McCoy
A 2.1 x 2.5 cm slice of this meteorite was examined. Small areas of fusion crust are present in re-entrants on the edge of the meteorite. The bulk of the meteorite is composed of taenite with needlelike lamellae of kamacite and rare schreibersite rimmed by high-Ni taenite. The kamacite lamellae are up to 1 mm in length and are typically 50 microns in width. The average composition based on a microprobe traverse of 100 points is 19.9% Ni, 0.1% P. The meteorite is likely a IVB iron.
Antarctic Meteorite Images for Sample LAR 12138
Lab Photo of Sample LAR 12138 Displaying Bottom Orientation  Lab Photo of Sample LAR 12138 Displaying East Orientation  Lab Photo of Sample LAR 12138 Displaying North Orientation  Lab Photo of Sample LAR 12138 Displaying South Orientation 
Lab Photo of Sample LAR 12138 Displaying Top Orientation  Lab Photo of Sample LAR 12138 Displaying West Orientation  Thin Section Photo of Sample LAR 12138 in Reflected Light with 1.25X Magnification  Thin Section Photo of Sample LAR 12138 in Reflected Light with 2.5X Magnification 
Data from:
  MB104
  Table 0
  Line 0:
Date:2012
Mass (g):184.7
Pieces:1
Class:Iron, IVB
Classifier:SI
Type spec mass (g):184.7
Type spec location:JSC
Main mass:JSC
Finder:ANSMET
Comments:Submitted by AMN
Institutions
   and collections
JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 38(1) (2015), JSC, Houston
Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography:

Antarctica
Coordinates:Unknown.

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

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