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Larkman Nunatak 12248
Basic information Name: Larkman Nunatak 12248
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12248
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 113.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 36(2)  (2013)  Diogenite
Meteoritical Bulletin:  MB 102  (2013)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 439 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 30 Aug 2013
Writeuphelp
Writeup from AMN 36(2):
Sample Number LAR 12248
Newsletter 36,2
Location Larkman Nunatak
Field Number 23937
Dimensions 5.0 x 4.5 x 3.0
Weight 113.45
Original Classification Diogenite
Pairing LAR 12248; LAR 12320
Mineral Composition (%Fa &  %Fs)
Ferrosilite (mol%): 29
Weathering
B
Fracturing
A/B
Macroscopic Description - Kathleen McBride and Cecilia Satterwhite
The exterior surfaces have black/brown patches of fusion crust with polygonal fractures. Exposed areas without fusion crust are yellow to crème colored matrix with some gray patches. The interior matrices are fine grained, tan to weathered yellow-ochre in color, with a few darker inclusions.
Thin Section Description (,2) - Cari Corrigan and Linda Welzenbach
These sections are similar enough that one description will suffice. The sections show a groundmass of coarse (up to 1.5 mm) comminuted pyroxene, with minor plagioclase and SiO2. Plagioclase also exists as individual rounded grains. Both sections contain a pervasive porosity that gives them a strange, mottled appearance. In some areas, large relict pyroxene grains (up to 1 cm) are present (some still exhibiting exsolution), but are still mosaicized and overprinted by porosity. This gives the sections the appearance of being brecciated but without strong clast boundaries. All silicates are mosaicized. Pyroxenes are Fs14-31. Feldspars are An92-94Or0.1. The Fe/Mn ratio of the pyroxene is ~27-28. The meteorites appear to be diogenites.
Antarctic Meteorite Images for Sample LAR 12248
Thin Section Photograph of Sample LAR 12248 in Plane-Polarized Light  Thin Section Photograph of Sample LAR 12248 in Reflected Light  Thin Section Photograph of Sample LAR 12248 in Cross-Polarized Light  Thin Section Photograph of Sample LAR 12248 in Plane-Polarized Light 
Thin Section Photograph of Sample LAR 12248 in Reflected Light  Thin Section Photograph of Sample LAR 12248 in Cross-Polarized Light  Bottom View of Sample LAR 12248  East View of Sample LAR 12248 
North View of Sample LAR 12248  South View of Sample LAR 12248  West View of Sample LAR 12248  Splits View of Sample LAR 12248 
Top View of Sample LAR 12248  Pie Shot View of Sample LAR 12248 
Data from:
  MB102
  Table 0
  Line 0:
Date:2012
Mass (g):113.5
Pieces:1
Class:Diogenite
Weathering grade:B
Ferrosilite (mol%):29
Classifier:SI
Type spec mass (g):113.5
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:
Find references in Google Scholar:
Geography:

Antarctica
Coordinates:Unknown.

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

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