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Larkman Nunatak 12216
Basic information Name: Larkman Nunatak 12216
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12216
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 16.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 39(1)  (2016)  L3.5
Meteoritical Bulletin:  MB 105  (2016)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [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 12216
Newsletter 39,1
Location Larkman Nunatak
Field Number 23298
Dimensions 3.5 x 2.6 x 1.0
Weight 16.28
Original Classification L3.5 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 3-33; Ferrosilite (mol%): 13-18
Weathering
B
Fracturing
A
Macroscopic Description - Mitchell Haller
Black fusion crust covers 60% of the exterior surface; the other surface is weathered brown with some chondrules visible. The interior is a reddish black matrix with dark gray inclusions/chondrules and some silvery metals.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy
The section exhibits numerous large, well-defined chondrules (up to 2 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 moderately weathered. Silicates are unequilibrated; olivines range from Fa3-33 and pyroxene is Fs13-18Wo1. The meteorite is an L3 chondrite (estimated subtype 3.5).
Antarctic Meteorite Images for Sample LAR 12216
Lab Photo of Sample LAR 12216   Thin Section Photo of Sample LAR 12216 in Plane-Polarized Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12216 in Reflected Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12216 in Cross-Polarized Light with 2.5X Magnification 
Thin Section Photo of Sample LAR 12216 in Plane-Polarized Light with 5X Magnification  Thin Section Photo of Sample LAR 12216 in Reflected Light with 5X Magnification  Thin Section Photo of Sample LAR 12216 in Cross-Polarized Light with 5X Magnification 
Data from:
  MB105
  Table 0
  Line 0:
Date:2012
Mass (g):16.3
Pieces:1
Class:L3.5
Weathering grade:B
Fayalite (mol%):3-33
Ferrosilite (mol%):13-18
Classifier:SI
Type spec mass (g):16.3
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
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Geography:

Antarctica
Coordinates:Unknown.

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

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