NWA 13742 HED Achondrite BASALTIC Eucrite Breccia Meteorite 4.8 gram fragment

Description

NORTHWEST AFRICA 13742
HED ACHONDRITE BASALTIC EUCRITE BRECCIA METEORITE
4.8 GRAM FRAGMENT
Physical characteristics: Samples are irregularly shaped and have a dark exterior lacking fusion crust. Some samples contain small holes that may represent vesicles. The cut face shows the interior is composed of abundant light-colored crystalline clasts set in a dark matrix.
Petrography: Description and classification (A. Love, App) Sample is a breccia composed of mm-sized angular, basaltic-textured clasts set within a comminuted matrix of related debris. Pyroxenes are exsolved and both pyroxene and plagioclase show clouding by opaques and other phases. Additional minerals are: ilmenite, chromite, a silica polymorph, phosphates and terrestrial barite.
Geochemistry: low Ca pyroxene (Fs64.1±1.0Wo2.6±0.7, Fe/Mn=30.5±1.1, Mg#=34.2±0.6, n=12); high Ca pyroxene (Fs29.1±1.7Wo42.6±2.0, Fe/Mn=31.9±1.0, n=12); plagioclase (An91.9±0.7Or0.4±0.1, n=9).
OFFICIAL CLASSIFICATION DATA SOURCE:
The Meteoritical Society
International Society for Meteoritics and Planetary Science
Lunar and Planetary Institute
Meteoritical Bulletin Database
Northwest Africa 13742
Basic information
Name:
Northwest Africa 13742
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13742
Observed fall:
No
Year found:
2020
Country:
Mauritania
Mass:
272 g
Classification
history:
Recommended:
eucrite
This is 1 of 554 approved meteorites (plus 1 unapproved name) classified as eucrite.
Comments:
Approved 21 Feb 2021
Writeup
Writeup from MB 110:
Northwest Africa 13742
(NWA 13742)
Mauritania
Purchased: 2020
Classification: HED achondrite (Eucrite)
History
: Thirty-four samples with a TKW of 271.6 g were found in December 2020 by anonymous prospectors in Mauritania. John Higgins purchased the samples from a Mauritanian meteorite dealer in 2020.
Physical characteristics
: Samples are irregularly shaped and have a dark exterior lacking fusion crust. Some samples contain small holes that may represent vesicles. The cut face shows the interior is composed of abundant light-colored crystalline clasts set in a dark matrix.
Petrography
: Description and classification (A. Love,
App
) Sample is a breccia composed of mm-sized angular, basaltic-textured clasts set within a comminuted matrix of related debris. Pyroxenes are exsolved and both pyroxene and plagioclase show clouding by opaques and other phases. Additional minerals are: ilmenite, chromite, a silica polymorph, phosphates and terrestrial barite.
Geochemistry
: low Ca pyroxene (Fs
64.1±1.0
Wo
2.6±0.7
, Fe/Mn=30.5±1.1, Mg#=34.2±0.6, n=12); high Ca pyroxene (Fs
29.1±1.7
Wo
42.6±2.0
, Fe/Mn=31.9±1.0, n=12); plagioclase (An
91.9±0.7
Or
0.4±0.1
, n=9).
Classification
: HED achondrite (eucrite). Mineral compositions and textures suggest sample is an equilibrated basaltic eucrite breccia (M-S3, low weathering).
Specimens
: John Higgins holds the main masses. 7 slices, endpieces and fragments weighing 27.98 g, a polished mount and thin section are on deposit at
App
.
Data from:
MB110
Table 0
Line 0:
Date:
P 2020
Mass (g):
271.6
Pieces:
34
Class:
eucrite
Shock stage:
M-S3
Weathering grade:
low
Ferrosilite (mol%):
64.1±1.0; 29.1±1.7
Wollastonite (mol%):
2.6±0.7; 42.6±2.0
Magnetic suscept.:
2.92
Classifier:
A. Love, App
Type spec mass (g):
27.98
Type spec location:
App
Main mass:
John Higgins
Comments:
Submitted by Anthony Love
Institutions
and collections
Department of Geology Appalachian State University
Catalogs:
References:
Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Geography:
Coordinates:
Unknown.
Statistics:
This is 1 of 166 approved meteorites from Mauritania
(plus 2 unapproved names) (plus 2 impact craters)
IMCA ( INTERNATIONAL METEORITE COLLECTORS ASSOCIATION )
I AM MEMBER # 9822  JOHN HIGGINS. THIS METEORITE IS FROM MY PERSONAL COLLECTION. I AM THE MAIN MASS HOLDER WITH NO BREAKS IN THE CHAIN OF PROVENANCE. MY NAME MATCHES THE ONE LISTED IN THE METEORITICAL SOCIETY BULLETIN OF WHICH I AM A LONGTIME MEMBER IN GOOD STANDING. I HAVE GONE THROUGH GREAT LENGTHS TO PERSONALLY PROCURE, CURATE, CUT AND PRESENT THIS METEORITE. THIS OFFICIALLY CLASSIFIED HIGH QUALITY METEORITE  HAS CONTRIBUTED TO THE SCIENCE OF METEORITICS THROUGH RESEARCH LED BY ANTHONY LOVE.
GUARANTEED AUTHENTICITY
Member of the Meteoritical Society & International Meteorite Collectors Association The authenticity of this meteorite has a 100% guarantee.
Signed Certificate of Authenticity Included
. First class delivery and provenance provided exhibiting important details of the classification & petrography.
1cm scale cube for reference purposes not included.
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