[meteorite-list] eBay RARE CV3 Anomalous - NWA 7891 - JUST LISTED 6 slices

From: Ruben Garcia <rubengarcia85382_at_meteoritecentral.com>
Date: Sun, 15 Feb 2015 17:58:22 -0700
Message-ID: <CAJet4mNjFFm8G3kghex3c4Co5_D+t94Qu-qTwax-=6qs70AYYA_at_mail.gmail.com>

HI all,

I just listed a few slices (6) of a RARE CV3 Anomalous - NWA 7891 If
you like rare carbonaceous meteorites take a look here. (BTW - there's
a lot of other cool meteorites here too)

http://www.ebay.com/sch/mr-meteorite/m.html?item=321670789344&rt=nc&_trksid=p2047675.l2562


Northwest Africa 7891
Basic information Name: Northwest Africa 7891
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7891
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 168 g
Classification
  history:
Recommended:

CV3-an [explanation]

This is 1 of 5 approved meteorites classified as CV3-an. [show all]
Search for other: Carbonaceous chondrites (type 3), CV-CK clan
chondrites, CV chondrites, and Carbonaceous chondrites
Comments: Approved 4 Jun 2013
Writeup
Writeup from MB 102:

Northwest Africa 7891 (NWA 7891)

Morocco

Purchased: 2012

Classification: Carbonaceous chondrite (CV3, anomalous)

History: Purchased by Aziz Habibi in Morocco, 2012.

Physical characteristics: Single stone, dark weathered fusion crust,
saw-cut reveals many chondrules and CAIs of variable size.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount
shows numerous PO and POP chondrules, many with irregular shapes, set
in fine-grained groundmass.

Geochemistry: (C. Agee, UNM) Type I chondrule olivine Fa0.8?0.3,
Cr2O3=0.18?0.08, CaO=0.44?0.19 wt%, n=9, Type II chondrule olivine
Fa10.6?10.0, range Fa1.9-40.2, Fe/Mn=69?69, Cr2O3=0.12?0.14,
CaO=0.20?0.12 wt%, n=25; enstatite Fs1.1?0.2Wo1.9?0.9, n=23; diopside
Fs2.8?2.6Wo34.5?0.7, n=4. (Karen Ziegler, UNM) Oxygen isotope mean
values of analyses on four acid-washed aliquots of bulk sample, 0.9,
1.2, 1.5, 1.4 mg, gave ?17O= -18.662, -15.455, -7.616, -6.818, ?18O=
-15.420, -11.700, -4.201, -2.390, ?17O= -10.520, -9.277, -5.398,
-5.556 (linearized, all permil).

Classification: Carbonaceous chondrite, CV3 anomalous, based on wide
range of O-isotope values, all on the CCAM line, in particular three
bulk analyses with low values far outside the CV3 range, also mean
value Fe/Mn of ferroan olivines is anomalously low with relatively
high standard deviation.

Specimens: 20.25 g including a probe mount on deposit at UNM, Aziz
Habibi holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2012
Mass (g):168
Pieces:1
Class:CV3-an
Fayalite (mol%):0.8?0.3, 10.6?10.0
Ferrosilite (mol%):1.1?0.2, 2.8?2.6
Wollastonite (mol%):1.9?0.9, 34.5?0.7
Classifier:C. Agee, UNM
Type spec mass (g):20.25
Type spec location:UNM
Main mass:Aziz Habibi
Comments:Submitted by C. Agee
Plots: O isotopes:
Institutions
   and collections UNM: Institute of Meteoritics MSC03 2050 University
of New Mexico Albuquerque NM 87131-1126 USA, United States; Website
(institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, in preparation (2013)
Find references in NASA ADS:
Find references in Google Scholar:

-- 
Rock On!
Ruben Garcia
http://www.MrMeteorite.com

Received on Sun 15 Feb 2015 07:58:22 PM PST