Meteoritical Bulletin: Entry for Northwest Africa 12334

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Northwest Africa 12334

Basic information

Name: Northwest Africa 12334
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12334
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 272 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	LL6-an
Recommended:			LL6-an [explanation]

This is 1 of 6 approved meteorites classified as LL6-an. [show all]
Search for other: LL chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 6 Oct 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12334 (NWA 12334)

(Northwest Africa)

Purchased: 2017

Classification: Ordinary chondrite (LL6, anomalous)

Petrography: Highly recrystallized chondrite with average size plagioclase 60 µm. Abundant sulfide, with rare magnetite.

Geochemistry: Olivine Fa_34.1±0.3, NiO 0.17±0.05 wt% (n=8). Low-Ca pyroxene Fs_27.5Wo_2.4(n=1). Chromite Cr#=0.88 (n=1). Plagioclase An_4.1Ab_80.0Or_15.9(n=1). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 255 mg bulk sample is δ¹⁷O=4.01‰, δ¹⁸O=5.14‰ , Δ¹⁷O=1.31‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively).

Classification: Ordinary chondrite (LL6-anomalous). The anomalous designation is based on the Fa content of olivine, magnetic susceptibility, and the opaque mineralogy. The Fa content of olivine is higher than for typical LL chondrite: only 1 out of 1715 LL chondrite has a higher Fa content (NWA 11776, LL6-an, with Fa_35.7). Magnetic susceptibility is also lower than in other moderaltely weathered LL chondrites. The opaque mineralogy, featuring magnetite and pyrrhotite, is unusual for a LL chondrite.

Specimens: 33.9 g and a polished section at CEREGE. Main mass with R. Lenssen

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Western Sahara
Date:	P 2017
Mass (g):	272
Pieces:	1
Class:	LL6-an
Weathering grade:	moderate
Fayalite (mol%):	34.1±0.3 (n=8)
Ferrosilite (mol%):	27.5 (n=1)
Wollastonite (mol%):	2.4
Magnetic suscept.:	3.06
Classifier:	L.K. Ruggiu and J. Gattacceca, CEREGE
Type spec mass (g):	33.9
Type spec location:	CEREGE
Main mass:	R. Lenssen
Comments:	Work name RL05; submitted by Jérôme Gattacceca

Plots:

O isotopes:

Institutions
and collections

CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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