NWA 15321 HED Achondrite Monomict Breccia Eucrite Meteorite 6.5g complete slice

Description

NORTH WEST AFRICA 15321
MONOMICT BRECCIA EUCRITE
TYPE
HED ACHONDRITE METEORITE
6.5 GRAM COMPLETE SLICE
BEAUTIFUL FRESH INTERIOR SHOWING ALTERNATING LITHIC DIABASIC CLASTS
AMONG A MATRIX OF FINER CRYSTALLINE DEBRIS.
OFFICIAL CLASSIFICATION DATA SOURCE:
The Meteoritical Society
International Society for Meteoritics and Planetary Science
Lunar and Planetary Institute
Meteoritical Bulletin Database
Northwest Africa 15321
Basic information
Name:
Northwest Africa 15321
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 15321
Observed fall:
No
Year found:
2020
Country:
Algeria
Mass:
257 g
Classification
history:
Recommended:
Eucrite-mmict
This is 1 of 269 approved meteorites classified as Eucrite-mmict.
Comments:
Approved 22 Oct 2022
Writeup
Writeup from MB 111:
Northwest Africa 15321
(NWA 15321)
Algeria
Purchased: 2020 Feb
Classification: HED achondrite (Eucrite, monomict)
History
: Purchased by John Higgins in February 2020 from a Sahrawi dealer in Algeria.
Petrography
: (A. Irving,
UWS
and J. Boesenberg,
BrownU
) Monomict breccia composed of lithic diabasic eucrite clasts plus related crystalline debris. Minerals are pigeonite, augite, exsolved pigeonite, calcic plagioclase, silica polymorph, fayalite, chromite, ilmenite, zircon, merrillite, Fe metal and minor secondary barite.
Geochemistry
: Low-Ca pyroxene (Fs
59.7-61.1
Wo
5.9-4.3
, FeO/MnO = 29-31, N = 4), pigeonite (Fs
54.67
Wo
9.3
; Fs
50.0-50.5
Wo
15.6-13.3
; FeO/MnO = 29-30; N = 3), subcalcic augite (Fs
40.2-44.0
Wo
28.8-24.2
; Fs
35.8
Wo
34.1
; FeO/MnO = 28-31; N = 3), fayalite (Fa
84.1
, FeO/MnO = 41), plagioclase (An
79.3-84.5
Or
1.6-0.5
, N = 6).
Classification
: Eucrite (monomict breccia).
Specimens
: 20.4 g including one polished thin section at
UWB
; remainder with Mr. J. Higgins.
Data from:
MB111
Table 0
Line 0:
Place of purchase:
Algeria
Date:
P 2020 Feb
Mass (g):
257
Pieces:
1
Class:
Eucrite-mmict
Shock stage:
low
Weathering grade:
low
Fayalite (mol%):
84.1
Ferrosilite (mol%):
59.7-61.1; 50.0-50.5; 40.2-44.0
Wollastonite (mol%):
5.9-4.3; 15.6-13.3; 28.8-24.2
Classifier:
A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):
20.4
Type spec location:
UWB
Main mass:
J. Higgins
Comments:
Work name JH22-3; submitted by A. Irving
Institutions
and collections
University of Washington
Brown University
Catalogs:
References:
Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Geography:
ALGERIA
Coordinates:
Unknown.
Statistics:
This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)
( 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, EXTENSIVELY POLISH AND PRESENT THIS METEORITE. THIS OFFICIALLY CLASSIFIED HIGH QUALITY METEORITE  HAS CONTRIBUTED TO THE SCIENCE OF METEORITICS THROUGH RESEARCH LED BY  THE WORLD RENOWN TEAM OF TONY IRVING AND JOSEPH BOSENBERG AT BROWN UNIVERSITY.
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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