On Offer: 1.66g C3-ung carbonaceous chondrite fragment

Official Name: NWA 12416

Description: This is a 1.66g specimen of NWA 12416 C3-ung carbonaceous chondrite.

Type: C3-ung Carbonaceous Chondrite Meteorite

Note: This meteorite along with a few other ungrouped carbonaceous "C" chondrites comprise a group of existing carbonaceous chondrites who's stable oxygen isotope ratios have recently been found to plot along the same unique line. As such, a new subgroup of carbonaceous chondrites has been proposed, known as the "CT "subgroup. While this new subgroup has been suggested, it has not yet been voted on or approved by Nomenclature Committee as of this writing 3/5/2022.

The petrologic designation of "3", indicates that the meteorite is unequilibrated and was not altered by water or chemical equilibration.

The "-ung" (ungrouped) designation is indicative of how unique this particular specimen of carbonaceous chondrites is, and to-date it still does not fit into any known carbonaceous classification structure, though it may soon.

What you get: 1.66 gram NWA 12416 C3-ung carbonaceous chondrite Meteorite Specimen as shown, Membrane Storage/Display Box, & signed Certificate of Authenticity.

We offer a 100% no questions asked 30 day return policy.

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Northwest Africa 12416

Basic information

Name: Northwest Africa 12416
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12416
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 875 g

Classification
history:

Meteoritical Bulletin:		(2020)	C3-ung
Recommended:			C3-ung

This is 1 of 23 approved meteorites classified as C3-ung.[show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites

Comments:

Approved 27 Jul 2019

Writeup

Writeup from MB 108:

Northwest Africa 12416 (NWA 12416)

(Northwest Africa)

Purchased: 2018 Jul

Classification: Carbonaceous chondrite (C3, ungrouped)

History: The first batch of this material was purchased by Adam Aaronson in July 2018 in Temara, Morocco; subsequently additional material was purchased from the same Moroccan source by Mark Lyon and others.

Physical characteristics: The material consists of numerous small black, friable stones, some completely fusion crusted (total weight 875 g).

Petrography: (A. Irving and S. Kuehner, UWS; L. Garvie, ASU) Granular chondrules (apparent diameter 350±210 µm, N = 15) together with sparse mineral fragments and AOA (but no identifiable CAI or related mineral grains) are set in very fine grained matrix (~50 vol.%, black in thin section) containing minor kamacite and pentlandite. No phyllosilicates were detectable by X-ray diffraction.

Geochemistry: Olivine (Fa_1.0-67.1, N = 3), orthopyroxene (Fs_1.7-4.3Wo_0.9-3.1, N = 2), clinopyroxene (Fs_1.1Wo_23.2). Oxygen isotopes (K. Ziegler, UNM) Analyses of acid-washed subsamples by laser fluorination gave, respectively, δ¹⁷O -10.290, -0.181, -11.117; δ¹⁸O -6.827, 7.352, -7.023; Δ¹⁷O -6.685, -4.063, -7.409 per mil.

Classification: Carbonaceous chondrite (ungrouped Type 3). Oxygen isotope compositions plot at more negative Δ¹⁷O values than for CV, CK and most CM chondrites, and the absence of phyllosilicates excludes affinity to typical CM2 chondrites.

Specimens: 20.1 g including one polished thin section at UWB; 152 g at ASU; 361 g with Mr. M. Lyon; 137 g with Mr. M. Ouzillou; 205 g with Mr. A. Aaronson.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Temara
Date:	P 2018 Jul
Mass (g):	875
Pieces:	many
Class:	C3-ung
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	1.0-67.1
Ferrosilite (mol%):	1.7-4.3
Wollastonite (mol%):	0.9-3.1
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.1
Type spec location:	UWB
Main mass:	A. Aaronson/M. Lyon/M. Ouzillou
Comments:	Work name M2151; submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)