Meteoritical Bulletin: Entry for Larkman Nunatak 12156

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Larkman Nunatak 12156

Basic information

Name: Larkman Nunatak 12156
This is an OFFICIAL meteorite name.
Abbreviation: LAR 12156
Observed fall: No
Year found: 2012
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 59.2 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 40(1)	(2017)	EH3
Meteoritical Bulletin:	MB 106	(2018)	EH3
Antarctic Meteorite Newsletter:	AMN 47(1)	(2024)	EL3
Recommended:			EL3 [explanation]

This is 1 of 28 approved meteorites classified as EL3. [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites

Comments:

Approved 25 Feb 2017
Revised 26 Mar 2024: Reclassified in AMN 47(1)

Writeup

help

Writeup from AMN 40(1):

Sample Number

LAR 12156

Newsletter

40,1

Location

Larkman Nunatak

Field Number

23140

Dimensions

2.0 x 4.5 x 3.0

Weight

59.20

Original Classification

EH3 Chondrite

Mineral Composition (%Fa & %Fs)

Ferrosilite (mol%): 0-7

A

A

Macroscopic Description - Rachel Funk

Black fusion crust covers the exterior of this enstatite chondrite, fractures and minor amounts of reddish/orange rust are visible. The interior is a dark groundmass with minor amounts of orange rust and shiny metals are visible throughout.

Thin Section Description (,2) - Cari Corrigan, Tim McCoy

The section shows an aggregate of chondrules (up to 1 mm), chondrule fragments, and pyroxene grains in a matrix of about 30% metal and sulfide. Chondrules contain minor abundances of olivine. Weathering is minor. Microprobe analyses show the pyroxene is Fs_0-7 and that the Fe,Ni metal contains 3 wt. % Si. The meteorite is an EH3 chondrite.

Antarctic Meteorite Images for Sample LAR 12156

Lab Group Photo of Sample LAR 12156

Thin Section Photo of Sample LAR 12156 in Plane-Polarized Light with 2.5X Magnification

Thin Section Photo of Sample LAR 12156 in Reflected Light with 2.5X Magnification

Thin Section Photo of Sample LAR 12156 in Cross-Polarized Light with 2.5X Magnification

Thin Section Photo of Sample LAR 12156 in Plane-Polarized Light with 5X Magnification

Thin Section Photo of Sample LAR 12156 in Reflected Light with 5X Magnification

Thin Section Photo of Sample LAR 12156 in Cross-Polarized Light with 5X Magnification

Data from:
  MB106
  Table 0
  Line 0:

Date:	2012
Mass (g):	59.2
Pieces:	1
Class:	EH3
Weathering grade:	A
Ferrosilite (mol%):	0-7
Classifier:	SI
Type spec mass (g):	59.2
Type spec location:	JSC
Main mass:	JSC
Finder:	ANSMET
Comments:	Submitted by AMN

Institutions
and collections

JSC: Mailcode XI, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 28 Jul 2022)
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 40(1) (2017), JSC, Houston
Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

Find references in NASA ADS:
Find references in Google Scholar:

Geography:

Antarctica

Antarctica

Coordinates:

Unknown.

Statistics:
This is 1 of 45260 approved meteorites from Antarctica (plus 3472 unapproved names)

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