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Larkman Nunatak 12142
Basic information Name: Larkman Nunatak 12142
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12142
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 68.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 39(1)  (2016)  L3.6
Meteoritical Bulletin:  MB 105  (2016)  L3.6
Recommended:  L3.6    [explanation]

This is 1 of 57 approved meteorites classified as L3.6.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 27 Feb 2016
Writeuphelp
Writeup from AMN 39(1):
Sample Number LAR 12142
Newsletter 39,1
Location Larkman Nunatak
Field Number 23146
Dimensions 4.0 x 3.5 x 3.0
Weight 68.40
Original Classification L3.6 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 2-40; Ferrosilite (mol%): 26
Weathering
AE
Fracturing
A
Macroscopic Description - Rachel Funk
85% of the exterior has black fusion crust with evaporites. The exposed surface has dark brown and rusty areas with some white inclusions/chondrules visible. The dark matrix with white and gray inclusions/chondrules has some minor amounts of orange rusty shiny metal throughout.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy
The section exhibits numerous large, well-defined chondrules (up to 1.5 mm) in a dark matrix of fine-grained silicates, metal and troilite. Weak shock effects are present. Polysynthetically twinned pyroxene is present. The meteorite is highly weathered. Silicates are unequilibrated; olivines range from Fa2-40 and pyroxene is Fs25Wo1. The meteorite is an L3 chondrite (estimated subtype 3.6).
Antarctic Meteorite Images for Sample LAR 12142
Lab Photo of Sample LAR 12142   Lab Photo of Sample LAR 12142 Displaying North Orientation  Thin Section Photo of Sample LAR 12142 in Plane-Polarized Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12142 in Reflected Light with 2.5X Magnification 
Thin Section Photo of Sample LAR 12142 in Cross-Polarized Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12142 in Plane-Polarized Light with 5X Magnification  Thin Section Photo of Sample LAR 12142 in Reflected Light with 5X Magnification  Thin Section Photo of Sample LAR 12142 in Cross-Polarized Light with 5X Magnification 
Data from:
  MB105
  Table 0
  Line 0:
Date:2012
Mass (g):68.4
Pieces:1
Class:L3.6
Weathering grade:Ae
Fayalite (mol%):2-40
Ferrosilite (mol%):26
Classifier:SI
Type spec mass (g):68.4
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 39(1) (2016), JSC, Houston
Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/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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