1.88g CR2 Carbonaceous Chondrite Meteorite End Cut I NWA 7020 - TOP METEORITE

Description

On Offer:
1.88g end cut of CR2 | NWA 7020
Type:
CR2 Carbonaceous Chondrite
Origin:
Northwest Africa
Official name:
NWA 7020
Description:
1.88 gram end cut of CR2 carbonaceous chondrite NWA 7020
What you get:
1.88 gram CR2 NWA 7020 Meteorite Specimen as Shown, Membrane Storage/Display Box, & signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day return policy.
SEE OFFICIAL METEORITICAL BULLETIN DATABASE ENTRY BELLOW
Northwest Africa 7020
Basic information
Name:
Northwest Africa 7020
This is an OFFICIAL meteorite name.
Abbreviation:
NWA 7020
Observed fall:
No
Year found:
2011
Country:
(Northwest Africa)
Mass:
715 g
Classification
history:
Meteoritical Bulletin:
(2013)
CR2
Recommended:
CR2
[explanation]
This is 1 of 182 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments:
Approved 22 Oct 2013
Writeup
Writeup from MB 102:
Northwest Africa 7020
(NWA 7020)
(Northwest Africa)
Purchased: 2011 Feb
Classification: Carbonaceous chondrite (CR2)
History
: Purchased by Blaine Reed from a Moroccan dealer at the Tucson Gem and Mineral Show in February 2011.
Petrography
: (A. Irving and S. Kuehner,
UWS
) Fairly closely-packed, medium-sized (typically 0.4 to 0.7 mm) chondrules and rare fine-grained CAI in a red to brown stained matrix containing kamacite, pentlandite and possible cronstedtite-tochilinite (based on EMPA spectra). Some chondrules are partially rimmed by kamacite. CAI contain spinel partially rimmed by gehlenite and rare Al-diopside.
Geochemistry
: Olivine (Fa
1.8-58.1
, n=8, Cr
2
O
3
in ferroan olivine 0.34-0.42 wt.%, n=6), orthopyroxene (Fs
1.3-1.5
Wo
0.7-0.9
), subcalcic augite (Fs
4.6
Wo
28.5
), augite (Fs
1.6-3.3
Wo
44.1-39.2
). Oxygen isotopes (R. Tanaka,
OkaU
): analyses of acid-washed subsamples by laser fluorination gave δ
17
O -2.101, -3.022; δ
18
O 1.026, -0.014; Δ
17
O -2.643, -3.019.
Classification
: Carbonaceous chondrite (CR2).
Specimens
: The main mass is held by
Reed
. A total of 22.8 g of material and one polished thin section are on deposit at
PSF
.
Data from:
MB102
Table 0
Line 0:
Place of purchase:
Tucson
Date:
P 2011 Feb
Mass (g):
715
Pieces:
many
Class:
CR2
Shock stage:
S2
Weathering grade:
W2
Fayalite (mol%):
1.8-58.1 (n=8)
Ferrosilite (mol%):
1.3-1.5
Wollastonite (mol%):
0.7-0.9
Classifier:
A. Irving and S. Kuehner, UWS
Type spec mass (g):
22.8
Type spec location:
PSF
Main mass:
B. Reed
Comments:
TN; submitted by P. Sipiera
Plots:
O isotopes:
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)
OkaU
: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Reed
: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)