NWA 13176 HED Cataclastic Brecciated Diogenite Meteorite 74 grams

Description

NORTHWEST AFRICA 13176
HED CATACLASTIC BRECCIATED DIOGENITE METEORITE
74 GRAM MASS
BEAUTIFUL FLIGHT ABLATED SPECIMEN
CATACLASTIC BRECCIA INCLUDES ORTHOPYROXENE AND AUGITE
FRESH METEORITE WITH NICE FUSION CRUST
OFFICIAL CLASSIFICATION DATA SOURCE:
The Meteoritical Society
International Society for Meteoritics and Planetary Science
Lunar and Planetary Institute
Meteoritical Bulletin Database
Northwest Africa 13176
Basic information
Name:
Northwest Africa 13176
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13176
Observed fall:
No
Year found:
2019
Country:
Algeria
Mass:
223 g
Classification
history:
Recommended:
Diogenite
[explanation]
This is 1 of 444 approved meteorites classified as Diogenite.
[show all]
Search for other:
Achondrites
,
Diogenites
, and
HED achondrites
Comments:
Approved 28 Mar 2020
Writeup
Writeup from MB 109:
Northwest Africa 13176
(NWA 13176)
Algeria
Find: 2019
Classification: HED achondrite (Diogenite)
History
: Three samples weighing (91.79, 56.39, 74.3 7g) were found in the desert near Tindouf, Algeria, in March 2019. Dave Lehman and a partner acquired the samples from the collector.
Physical characteristics
: Samples are irregularly shaped and are partially covered with a black, wind-ablated fusion crust. One sample shows flight orientation with weak flow lines and frothy fusion crust covering the crusted portions of the sample. The uncrusted portions with fractured surfaces are light greenish colored.
Petrography
: Description and classification (A. Love,
App
) Sample is a cataclastic breccia composed of dominant lath-shaped orthopyroxene up to ~9 mm and augite. Additional minerals are (~3 vol%) twinned plagioclase (with an average length of 529µm), chromite, troilite, a silica polymorph and rare K-feldspar (Or
98
An
1.8
).
Geochemistry
: (A. Love,
App
): Low Ca pyroxene (Fs
24.1±0.2
Wo
2.0±0.5
, Fe/Mn=27.6±0.3, Mg#75.4±0.2, n=10); high Ca pyroxene (Fs
7.8±0.3
Wo
45.8±0.4
, Fe/Mn=21.7±1.8, n=5); plagioclase (An
83.8±2.1
Or
0.2±0.1
, n=3).
Classification
: HED achondrite (Diogenite). Textures, mineralogy and Fe/Mn ratios of pyroxenes suggest this sample is a diogenite breccia. Weathering grade is low.
Specimens
: Dave Lehman and a partner hold the main masses. An endcut and 2 slices weighing 20.97 g and a polished thin section are on deposit at
App
.
Data from:
MB109
Table 0
Line 0:
Date:
2019
Mass (g):
222.52
Pieces:
3
Class:
Diogenite
Shock stage:
moderate
Weathering grade:
low
Ferrosilite (mol%):
24.1±0.2; 7.8±0.3
Wollastonite (mol%):
2.0±0.5; 45.8±0.4
Magnetic suscept.:
2.93
Classifier:
A. Love, App
Type spec mass (g):
20.97
Type spec location:
App
Main mass:
Dave Lehman
Finder:
Unknown
Comments:
Submitted by Anthony Love
Institutions
and collections
App
: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References:
Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:
Coordinates:
Unknown.
Statistics:
This is 1 of 1034 approved meteorites from
Algeria
(plus 26 unapproved names) (plus 4 impact craters)
Also see:
This lists the most popular meteorites among people who looked up this meteorite.
Revision
history:
This lists important revisions made to data for this record.
THIS OFFICIALLY CLASSIFIED HIGH QUALITY METEORITE  HAS CONTRIBUTED TO THE SCIENCE OF METEORITICS THROUGH RESEARCH LED BY  THE WORLD RENOWN ANTHONY LOVE AT APPALACHIAN STATE UNIVERSITY , NORTH CAROLINA
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