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Larkman Nunatak 06691
Basic information Name: Larkman Nunatak 06691
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 06691
Observed fall: No
Year found: 2006
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 17.7 g
Antarctic Meteorite Newsletter:  AMN 32(2)  (2009)  Mesosiderite
Meteoritical Bulletin:  MB 98  (2010)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 216 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 4 Sep 2009
Writeup from AMN 32(2):
Sample Number LAR 06691
Newsletter 32,2
Location Larkman Nunatak
Field Number 19569
Dimensions 2.5 x 1.5 x 2.0
Weight 17.66
Original Classification Mesosiderite
Macroscopic Description - Kathleen McBride
85% of the exterior has brown/black fusion crust with oxidation haloes and pits. The fine grained matrix is a gray color with a few very large grains. Sample is extremely rusty.
Thin Section (,2) Description - Cari Corrigan, Tim McCoy and Linda Welzenbach
This section consists of fragmented pyroxene and plagioclase grains set in a clastic, metal-rich matrix. Grains reach up to several mm in size. Pyroxene is relatively homogeneous (Fs28-35Wo2-6; Fe/Mn~30) and plagioclase is An90-95Or1. The meteorite is probably a silicate clast from a mesosiderite.
Antarctic Meteorite Images for Sample LAR 06691
LAR 06691 Meteorite Sample Photograph Showing North View  LAR 06691 Meteorite Thin Section Photo with 2.5x magnification in Plane-Polarized Light  LAR 06691 Meteorite Thin Section Photo with 2.5x magnification in Cross-Polarized Light  LAR 06691 Meteorite Thin Section Photo with 5x magnification in Plane-Polarized Light 
LAR 06691 Meteorite Thin Section Photo with 5x magnification in Cross-Polarized Light 
Data from:
  Table 2
  Line 174:
Mass (g):17.7
Weathering grade:B/C
Fayalite (mol%):
Ferrosilite (mol%):28-35
Type spec location:JSC, SI
Main mass:JSC
Comments:Fracturing A
   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)
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 32(2) (2009), JSC, Houston
Published in Meteoritical Bulletin, no. 98, MAPS 45, 1530-1551 (2010)
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     This is 1 of 40773 approved meteorites from Antarctica (plus 4570 unapproved names)

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