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Larkman Nunatak 12011
Basic information Name: Larkman Nunatak 12011
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12011
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 701 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 36(2)  (2013)  Martian (shergottite)
Meteoritical Bulletin:  MB 102  (2013)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 189 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 30 Aug 2013
Writeuphelp
Writeup from AMN 36(2):
Sample Number LAR 12011
Newsletter 36,2
Location Larkman Nunatak
Field Number 23233
Dimensions 14.5 x 6.0 x 6.0
Weight 701.17
Original Classification Shergottite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 23-58; Ferrosilite (mol%): 24-44
Weathering
A
Fracturing
A
Macroscopic Description - Kathleen McBride
95% of the exterior surface has shiny black fusion crust with a rough, ropey texture. The interior matrix is a gray with black, white and transparent mineral grains. This shergottite is very similar in appearance to LAR 06319.
Thin Section Description (,2) - Cari Corrigan and Linda Welzenbach
This meteorite is composed of a fine-grained assemblage of pyroxene, olivine and maskelynite. Olivine occurs as phenocrysts with grain sizes up to 1 mm (smaller and more abundant than 12095 and 12240). Olivines have a brown staining probably due to shock. Pyroxene and maskelynite in the matrix are 200-400 microns in size. The maskelynites appear foliated in this section. Olivine is Fa23-58; pyroxenes exhibit a range of compositions from pigeonite to subcalcic augite (Fs24-44Wo3-27; Fe/Mn 26-35); plagioclase feldspar is intermediate in composition (An49-52Or3). This meteorite is an olivine-phyric shergottite but is different enough from LAR 12095 and LAR 12240 that it is not being paired here. It does, however, look very similar to LAR 06319.
Antarctic Meteorite Images for Sample LAR 12011
Thin Section Photograph of Sample LAR 12011 in Plane-Polarized Light  Thin Section Photograph of Sample LAR 12011 in Reflected Light  Thin Section Photograph of Sample LAR 12011 in Cross-Polarized Light  Thin Section Photograph of Sample LAR 12011 in Plane-Polarized Light 
Thin Section Photograph of Sample LAR 12011 in Reflected Light  Thin Section Photograph of Sample LAR 12011 in Cross-Polarized Light  East View of Sample LAR 12011  Pie Shot View of Sample LAR 12011 
Splits View of Sample LAR 12011  Post Processing View of Sample LAR 12011  West View of Sample LAR 12011  North View of Sample LAR 12011 
Post Processing View of Sample LAR 12011  South View of Sample LAR 12011 
Data from:
  MB102
  Table 0
  Line 0:
Date:2012
Mass (g):701.2
Pieces:1
Class:Martian (shergottite)
Weathering grade:A
Fayalite (mol%):23-58
Ferrosilite (mol%):24-44
Classifier:SI
Type spec mass (g):701.2
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 36(2) (2013), JSC, Houston
Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
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Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)

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