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Larkman Nunatak 12090
Basic information Name: Larkman Nunatak 12090
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12090
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 252 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 39(1)  (2016)  L3.8
Meteoritical Bulletin:  MB 105  (2016)  L3.8
Recommended:  L3.8    [explanation]

This is 1 of 68 approved meteorites classified as L3.8.   [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 12090
Newsletter 39,1
Location Larkman Nunatak
Field Number 22612
Dimensions 7.0 x6.5 x 3.0
Weight 251.89
Original Classification L3.8 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 20-31
Weathering
B/CE
Fracturing
A/B
Macroscopic Description - Cecilia Satterwhite
Black/brown fusion crust is present on 75% of the meteorite’s exterior. Oxidation haloes and rusty areas are visible with some evaporites. The interior is a dark gray to black matrix with large gray inclusions/chondrules are visible. Oxidation is heavy in some areas with rust; most inclusion/chondrules are weathered.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy
The section exhibits numerous large, well-defined chondrules (up to 1.5 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 extensively weathered and stained. Silicates are unequilibrated; olivines range from Fa20-31 and pyroxene is Fs1Wo1. The meteorite is an L3 chondrite (estimated subtype 3.8).
Data from:
  MB105
  Table 0
  Line 0:
Date:2012
Mass (g):251.9
Pieces:1
Class:L3.8
Weathering grade:B/Ce
Fayalite (mol%):20-31
Classifier:SI
Type spec mass (g):251.9
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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