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Larkman Nunatak 12139
Basic information Name: Larkman Nunatak 12139
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12139
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 11.5 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 36(2)  (2013)  Howardite
Meteoritical Bulletin:  MB 102  (2013)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 383 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 30 Aug 2013
Writeuphelp
Writeup from AMN 36(2):
Sample Number LAR 12139
Newsletter 36,2
Location Larkman Nunatak
Field Number 23150
Dimensions 2.5 x 2.5 x 1.5
Weight 11.46
Original Classification Howardite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 42; Ferrosilite (mol%): 18-61
Weathering
B
Fracturing
B
Macroscopic Description - Kathleen McBride
Smooth brown/black fusion crust covers 50% of the exterior surface. The fine grained interior is tan to gray in color with black and white inclusions.
Thin Section Description (,2) - Cari Corrigan and Linda Welzenbach
The section shows a groundmass of comminuted pyroxene and plagioclase (up to 0.5 mm) with fine- to coarse-grained basaltic clasts ranging up to 5 mm. One large diogenitic clast (~1 cm) takes up much of the section. Most of the pyroxene is orthopyroxene with compositions ranging from Fs24-61Wo1-4 (most Fs24-30), a single augite of Fs18Wo42 and an olivine of Fa42. Fe/Mn is 27-32. The meteorite is a howardite.
Antarctic Meteorite Images for Sample LAR 12139
Thin Section Photograph of Sample LAR 12139 in Plane-Polarized Light  Thin Section Photograph of Sample LAR 12139 in Reflected Light  Thin Section Photograph of Sample LAR 12139 in Cross-Polarized Light  Thin Section Photograph of Sample LAR 12139 in Plane-Polarized Light 
Thin Section Photograph of Sample LAR 12139 in Reflected Light  Thin Section Photograph of Sample LAR 12139 in Cross-Polarized Light  West View of Sample LAR 12139  East View of Sample LAR 12139 
Splits View of Sample LAR 12139  North View of Sample LAR 12139  South View of Sample LAR 12139 
Data from:
  MB102
  Table 0
  Line 0:
Date:2012
Mass (g):11.5
Pieces:1
Class:Howardite
Weathering grade:B
Fayalite (mol%):42
Ferrosilite (mol%):18-61
Classifier:SI
Type spec mass (g):11.5
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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