Meteorite: NWA 7831 ultra thin 31.90 gram translucent slice.

Description

HI all!
My name is Mark Lyon, and I’m a member of the International Meteorite Collectors Association, member number 6752. My business model is to buy in bulk and turn over inventory quickly (often through no-reserve auctions) giving you the best possible prices.
When you finish looking at this, please look at my other no reserve sales and auctions, and feel free to contact me if you don't see exactly what you are looking for.
Up for sale here is an
NWA 7831 ultra thin 31.90 gram translucent slice.
I will be on vacation so will ship tis piece the Friday after the auction closes.
Here is that the metbull says about it.
Northwest Africa 7831
Basic information
Name:
Northwest Africa 7831
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 7831
Observed fall:
No
Year found:
2013
Country:
Western Sahara
Mass:
20 kg
Classification
history:
Meteoritical Bulletin:
MB 103
(2014)
Diogenite
Recommended:
Diogenite
[explanation]
This is 1 of 459 approved meteorites classified as Diogenite.
[show all]
Search for other:
Achondrites
,
Diogenites
, and
HED achondrites
Comments:
Approved 6 Sep 2014
Writeup
Writeup from
MB 103:
Northwest Africa 7831
(NWA 7831)        27.307°N, 12.083°W
Saguia el Hamra, Western Sahara
Found: 2013 Mar
Classification: HED achondrite (Diogenite)
History
: Found buried in the ground near Chouichiyat on March 3, 2013, and excavated by a team of local people.
Physical characteristics
: A single large mass (at least 20 kg) composed of yellow-green crystalline material with pale orange weathering products along numerous fractures. Much of the material disintegrated into fragments upon excavation.
Petrography
: (A. Irving and S. Kuehner,
UWS
) The specimen is composed almost entirely of translucent, yellow-green orthopyroxene with very sparse, tiny included grains of Ni-free metal, troilite, chromite, anorthite, silica polymorph and clinopyroxene. Secondary pale orange, clay-like deposits from terrestrial weathering are present along thin fractures.
Geochemistry
: Orthopyroxene (Fs
28.1-28.3
Wo
3.0-3.3
; FeO/MnO = 29-31), clinopyroxene (Fs
10.9
Wo
43.1
, FeO/MnO = 26). Oxygen isotopes (K. Ziegler,
UNM
): analyses of acid-washed orthopyroxene by laser fluorination gave, respectively, δ
17
O = 1.677, 1.793, 1.810; δ
18
O = 3.680, 3.879, 3.875; Δ
17
O = -0.266, -0.255, -0.236 per mil.
Specimens
: 44.5 g of material is on deposit at
UWB
. The remainder is held by several anonymous collectors.
Data from:
MB103
Table 0
Line 0:
State/Prov/County:
Saguia el Hamra
Date:
2013 Mar
Latitude:
27.307°N
Longitude:
12.083°W
Mass (g):
>20000
Pieces:
1
Class:
Diogenite
Shock stage:
low
Weathering grade:
moderate
Ferrosilite (mol%):
see text
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
45.4
Type spec location:
UWB
Main mass:
Anonymous
Comments:
Submitted by A. Irving