GEAT DEAL! END CUT! MAGNIFICENT NWA 7397 MARTIAN SHERGOTTITE METEORITE! .148 GMS

Description

MARVELOUS NWA 7397 MARTIAN METEORITE!!!
MARTIAN SHERGOTTITE FROM NORTHWEST AFRICA!!!
NICE MATRIX WITH EXCELLENT
EXTERNAL APPEARANCE
!!!
EXQUISITE END CUT
!!!
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Find: 2012!!!
Type: Martian Shergottite!!!
TKW: 2.13 Kilos!!!
Location: Northwest Africa!!!
Specimen Type: End Cut!!!
Specimen weight: .148
grams!!!
Northwest Africa 7397
Basic information
Name:
Northwest Africa 7397
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 7397
Observed fall:
No
Year found:
2012
Country:
(Northwest Africa)
Mass:
2.13 kg
Classification
history:
Meteoritical Bulletin:
MB 102
(2013)
Martian (shergottite)
Recommended:
Martian (shergottite)
This is 1 of 281 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).
Comments:
Approved 1 Jan 2013
Writeup
Writeup from MB 102:
Northwest Africa 7397
(NWA 7397)
Northwest Africa
Purchased: 2012 Jun
Classification: Martian meteorite (Shergottite)
History
: Found near Smara, Morocco and purchased by Darryl Pitt and David Gheesling from a dealer in Zagora, Morocco in 2012 June.
Physical characteristics
: A 2130 g, partially covered in fusion crust. Interior larger ovoid crystals in a finer grained matrix.
Petrography
: (A. Irving and S. Kuehner,
UWS
) Large oikocrysts (up to 1.5 cm across) of low-Ca pyroxene enclose multiple chadacrysts of olivine and Cr-rich chromite. Relatively equigranular domains between oikocrysts are composed of low-Ca and high-Ca pyroxene (showing very limited compositional zoning), maskleynite and olivine with accessory merrillite, Ti-chromite, pyrrhotite and ilmenite (with associated grains of baddeleyite up to 10
μ
m across). Olivine contains sparse melt inclusions composed of K-Na-Al-Si-rich glass surrounded by characteristic post-shock radial expansion microfractures.
Geochemistry
: Olivine (Fa
38.9-40.7
; FeO/MnO = 47-54), orthopyroxene (Fs
30.3
Wo
3.3
; FeO/MnO = 36), pigeonite (Fs
25.1-27.6
Wo
6.6-10.0
; FeO/MnO = 28-33), subcalcic augite (Fs
17.0-19.0
Wo
35.1-35.4
; FeO/MnO = 22-25). Bulk trace element composition (G. Chen,
UAb
): analysis by ICP-MS of clean wire-saw cutting dust gave (in ppm) La 1.66, Ce 4.48, Nd 2.93, Sm 1.13, Eu 0.3, Gd 1.59, Dy 1.95, Yb 1.02, Lu 0.14, Hf 1.66, Th 1.15, Rb 2.89, Sr 33.6.
Classification
: Martian (shergottite, poikilitic).
Specimens
: A total of 20 g of type material and one large polished thin section are on deposit at
UWB
. The main mass is held jointly by
DPitt
and D. Gheesling.
Data from:
MB 102
Table 0
Line 0:
Place of purchase:
Zagora
Date:
P 2012 Jun
Mass (g):
2130
Pieces:
1
Class:
Martian (shergottite)
Shock stage:
strong
Weathering grade:
low
Fayalite (mol%):
38.9-40.7
Ferrosilite (mol%):
30.3; 25.1-27.6; 17.0-19.0
Wollastonite (mol%):
3.3; 6.6-10.0; 35.1-35.4
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
20
Type spec location:
UWB
Main mass:
D. Pitt and D. Gheesling
Finder:
anonymous
Comments:
Submitted by A. Irving
BUYER TO PAY FOR USPS FIRST CLASS SHIPPING WITH TRACKING ANYWHERE IN THE U.S. OR BUYER TO PAY EBAY INTERNATIONAL STANDARD SHIPPING TO ANYWHERE ELSE IN THE WORLD. INSURANCE IS AT THE COST OF THE BUYER AND IS HIGHLY RECOMMENDED.
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