NWA 13738 LL3 Primitive Chondrite Meteorite 8.6g end cut with chondrules WOW

Description

NORTHWEST AFRICA 13738
LL3 CHONDRITE METEORITE
8.6 GRAM END CUT
TYPE 3 PRIMITIVE CHONDRULES
HIGHLY PRIMITIVE EARLY SUBTYPE 3.2-3.3
BEAUTIFUL & INTERESTING PRIMITIVE METEORITE
TYPE 3 METEORITES ARE AMONG THE OLDEST TYPE
DATING BACK TO THE EARLY FORMATION OF OUR SOLAR SYSTEM OVER 4 BILLION YEARS AGO MAKING THIS ONE OF THE OLDEST THINGS YOU COULD EVER HOLD IN YOUR HANDS
THE MATRIX IS COMPRISED OF WALL TO WALL CHONDRULES
OFFICIAL CLASSIFICATION DATA SOURCE:
The Meteoritical Society
International Society for Meteoritics and Planetary Science
Lunar and Planetary Institute
Meteoritical Bulletin Database
Northwest Africa 13738
Basic information
Name:
Northwest Africa 13738
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 13738
Observed fall:
No
Year found:
2020
Country:
Algeria
Mass:
431 g
Classification
history:
Recommended:
LL3
[explanation]
This is 1 of 361 approved meteorites classified as LL3.
[show all]
Search for other:
LL chondrites
,
LL chondrites (type 3)
,
Ordinary chondrites
, and
Ordinary chondrites (type 3)
Comments:
Approved 13 Feb 2021
Writeup
Writeup from MB 110:
Northwest Africa 13738
(NWA 13738)
Adrar, Algeria
Purchased: 2020
Classification: Ordinary chondrite (LL3)
History
: John Higgins purchased 9 pieces totaling 430.8 g, sourced from a market in Adrar in June 2020.
Physical characteristics
: Sample has a tabular shape, an orangish-brown weathered exterior showing abundant close-packed chondrules. A cut face shows the interior contains abundant chondrules set in a brown fine-grained matrix.
Petrography
: Description and classification (A. Love,
App
) Sample shows chondritic texture composed of numerous, well-defined, close-packed, unequilibrated chondrules with an avg. apparent diameter 640µm (n=106) set within a fine-grained opaque matrix. The sample contains a rounded clast with dispersed chondrules (~5 vol%, avg. diam. of 317, n=15). Additional minerals are: chromite, troilite, diopside, and Na and Ca-glasses.
Geochemistry
: Host: Olivine (Fa
16.8±10.8
(range Fa
0.6-37.7
), Cr
2
O
3
=0.12±0.06, Fe/Mn=32.7±16.5, n=21); low Ca pyroxene (Fs
17.7±11.0
Wo
1.7±1.1
, Fe/Mn=26.6±18.1, n=15); high Ca pyroxene (Fs
27.2
Wo
30.1
, Fe/Mn=14.3, n=1). Clast: Olivine (Fa
7.6-8.7
, Fe/Mn=106.2-34.0, n=2); low Ca Pyroxene (Fs
5.0-5.3
Wo
0.6-0.3
, Fe/Mn 10.3-16.4, n=2).
Classification
: Ordinary Chondrite (LL3, C-S2, W3). Based on chondrule size and magnetic susceptibility, sample is an LL chondrite. Poorly equilibrated mineral compositions, mean and standard deviation of Cr
2
O
3
in Type II chondrules (?3.2)
(Grossman and Brearley, 2005)
, presence of yellow mesostasis in chondrules (3.1/3.2), abundant chondrule glass (<3.3) suggest sample is LL3.2/3.3.
Specimens
: John Higgins holds the main mass. Three slices weighing a total of 23.09 g and a polished thin section are on deposit at
App
.
Bibliography:
Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites.
Meteorit. Planet. Sci.
40
, 87-122. (
link
)
Data from:
MB110
Table 0
Line 0:
State/Prov/County:
Adrar
Date:
P 2020
Mass (g):
430.8
Pieces:
9
Class:
LL3
Shock stage:
C-S2
Weathering grade:
W3
Fayalite (mol%):
16.8±10.8
Ferrosilite (mol%):
17.7±11.0; 27.2
Wollastonite (mol%):
1.7±1.1; 30.1
Magnetic suscept.:
3.65
Classifier:
A. Love, App
Type spec mass (g):
23.09
Type spec location:
App
Main mass:
John Higgins
Comments:
Submitted by Anthony Love
Institutions
and collections
App
: Department of Geology., Appalachian State University
Catalogs:
References:
Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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.
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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