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Larkman Nunatak 12128
Basic information Name: Larkman Nunatak 12128
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 12128
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 222 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 39(1)  (2016)  EH3
Meteoritical Bulletin:  MB 105  (2016)  EH3
Recommended:  EH3    [explanation]

This is 1 of 138 approved meteorites classified as EH3.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Comments: Approved 27 Feb 2016
Writeuphelp
Writeup from AMN 39(1):
Sample Number LAR 12128
Newsletter 39,1
Location Larkman Nunatak
Field Number 23174
Dimensions 10.0 x 6.0 x 4.0
Weight 222.33
Original Classification EH3 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 0.4; Ferrosilite (mol%): 1
Weathering
C
Fracturing
B/C
Macroscopic Description - Cecilia Satterwhite
60% of the exterior has brown/black fractured fusion crust with rusty brown weathered areas. Exterior is platy and breaks easily. The interior a rusty brown with metal and weathered inclusions/chondrules.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy
The section shows an aggregate of chondrules (up to 1.5 mm), chondrule fragments, and pyroxene grains in a matrix of about 30% metal and sulfide. Chondrules contain modest abundances of olivine. Weathering is modest, with staining of some enstatite grains and minor alteration of metal and sulfides. Microprobe analyses show the olivine is Fa0.4 and pyroxene is Fs1. The meteorite is a type 3 enstatite chondrite, probably an EH3.
Antarctic Meteorite Images for Sample LAR 12128
Lab Photo of Sample LAR 12128   Lab Photo of Sample LAR 12128 Displaying North Orientation  Lab Photo of Sample LAR 12128 Displaying South Orientation  Thin Section Photo of Sample LAR 12128 in Plane-Polarized Light with 2.5X Magnification 
Thin Section Photo of Sample LAR 12128 in Reflected Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12128 in Cross-Polarized Light with 2.5X Magnification  Thin Section Photo of Sample LAR 12128 in Plane-Polarized Light with 5X Magnification  Thin Section Photo of Sample LAR 12128 in Reflected Light with 5X Magnification 
Thin Section Photo of Sample LAR 12128 in Cross-Polarized Light with 5X Magnification 
Data from:
  MB105
  Table 0
  Line 0:
Date:2012
Mass (g):222.3
Pieces:1
Class:EH3
Weathering grade:C
Fayalite (mol%):0.4
Ferrosilite (mol%):1
Classifier:SI
Type spec mass (g):222.3
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
Find references in NASA ADS:
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Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)

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