Meteorite NWA 11448 - Primitive Achondrite Ureilite - Fragment 14.47g

Description

NWA 11448
NWA 11448
Found Sahara, 2017
Primitive Achondrite
Ureilite
Specimen is a 14.47g fragment, as found
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Olivine (~70 vol.%) and Pigeonite (~30 vol.%) exhibiting
some preferred shape orientation
A technical name for ureilite would be olivine-pigeonite achondrite. Compared to most other meteorites,
ureilites tend to have a high percentage of carbon (average 3% by weight) in the form of graphite and nanodiamonds.
The diamonds, which are rarely more than a few micrometres in diameter, are probably the result of high pressure shockwaves produced by collisions of the ureilite parent body with other asteroids.
A recent study
(
Carbon isotopic variation in ureilites: Evidence for an early, volatile-rich Inner Solar System
; Jean-Alix Barrat, Pierre Sansjofre, Akira Yamaguchi, Richard C.Greenwood, Philippe Gillet
), suggest the Ureilite Parent Body was an at least 690km size "planetoid" of the early Inner Solar System.
From the Meteoritical society Database :
Northwest Africa 11448
Basic information
Name:
Northwest Africa 11448
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 11448
Observed fall:
No
Year found:
2017
Country:
(Northwest Africa)
Mass:
62.7 g
Classification
history:
Recommended:
Ureilite
[explanation]
This is 1 of 437 approved meteorites classified as Ureilite.
Comments:
Approved 30 Oct 2017
Writeup
Writeup from MB 106:
Northwest Africa 11448
(NWA 11448)
(Northwest Africa)
Purchased: 2017 Apr
Classification: Ureilite
History
: Purchased by Fabien
Kuntz
in April 2017 from a dealer in Erfoud, Morocco.
Petrography
: (A. Irving and S. Kuehner,
UWS
) Aggregate of elongate grains of olivine (~70 vol.%) and pigeonite (~30 vol.%) exhibiting some preferred shape orientation, plus interstitial finer grained, dark brown zones. Olivine has reduced magnesian rims associated with blebby Fe metal.
Geochemistry
: Olivine (cores Fa
22.4-22.6
; rim Fa
11.8
; N = 3), pigeonite (Fs
17.7-18.0
Wo
10.3-10.1
, N = 2).
Classification
: Ureilite.
Specimens
: 12.86 g including one polished thin section at
PSF
; remainder with
Kuntz
.
Data from:
MB106
Table 0
Line 0:
Place of purchase:
Erfoud
Date:
P 2017 Apr
Mass (g):
62.7
Pieces:
1
Class:
Ureilite
Shock stage:
moderate
Weathering grade:
low
Fayalite (mol%):
22.4-22.6; 11.8
Ferrosilite (mol%):
17.7-18.0
Wollastonite (mol%):
10.3-10.1
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
12.86
Type spec location:
PSF
Main mass:
F. Kuntz
Comments:
Work name K339; submitted by A. Irving
Institutions
and collections
PSF
: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States;
Website
(institutional address; updated 1 Dec 2011)
UWS
: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz
: Fabien Kuntz, France;
Website
(private address)
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