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Larkman Nunatak 06319
Basic information Name: Larkman Nunatak 06319
     This is an OFFICIAL meteorite name.
Abbreviation: LAR 06319
Observed fall: No
Year found: 2006
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 78.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(2)  (2007)  Shergottite
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 189 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 31 Aug 2007
Writeuphelp
Writeup from AMN 30(2):
Sample No.: LAR 06319
Location: Larkman Nunatak
Field No.: 19318
Dimensions (cm):   5.5 x 3.5 x 2.5
Weight (g): 78.572
Meteorite Type:

Shergottite



Macroscopic Description: Kathleen McBride
The exterior has 60% dark brown to black fusion crust with very fine grained wrinkled texture. The fusion crust exhibits a slight sheen. The interior is a gray and black matrix that is fine grained and very hard.

Thin Section (,2) Description: Tim McCoy, Lauren LaCroix and Linda Welzenbach
The section is composed of a coarse-grained assemblage of pyroxene, olivine and maskelynite. Olivine occurs as phenocrysts with grain sizes up to 2.5 mm. Pyroxene and maskelynite in the matrix are finer grained, typically reaching 0.5 mm. Sulfides and oxides are present, as are shock melt veins. Olivine is Fa25-48; pyroxenes exhibit a range of compositions from pigeonite to subcalcic augite (Fs25-51Wo5-31; Fe/Mn ~ 23-35); feldspar is intermediate in composition (An46-52). The meteorite is an olivine-phyric shergottite.


Oxygen Isotopic Analysis: Z. Sharp, University of New Mexico
Oxygen isotopic analyses of two small (2-5 mg) pieces yielded the following results which fall in the martian meteorite field:

δ17O = 2.85, δ18O = 4.85, Δ18O = 0.33
δ17O = 2.83, δ18O = 4.92, Δ18O = 0.27
[where Δ18O = δ17O - 0.52 x δ18O]


Thin Section Images

Plane-Polarized
Light LAR 06319
Cross Polarized Light
LAR 06319
LAR06319 - Plane-Polarized Light LAR06319 - Cross Polarized Light



Lab Images

LAR 06319

Plots: O isotopes:  
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 30(2) (2007), JSC, Houston
Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photographs from AMN:
JSC A photo is in the write-up above
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)

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