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Northwest Africa 12735
Basic information Name: Northwest Africa 12735
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12735
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 285 g
Meteoritical Bulletin:  MB 109  (2021)  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 31 Jan 2020
Writeup from MB 109:

Northwest Africa 12735 (NWA 12735)

(Northwest Africa)

Purchased: 2018

Classification: LL6-anom

History: Bought in Morocco in 2018

Physical characteristics: Brown stone. Cut face reveals dark gray interior.

Petrography: (J. Gattacceca, CEREGE) Recrystallized chondrite with olivine dominant over pyroxene. Plagioclase average size above 50 µm. Opaque are sulfides (indlcuding pentlandite) and magnetite. No metal was observed

Geochemistry: Olivine Fa33.6±0.2, NiO 0.10±0.04 wt% (n=4). Orthopyroxene Fs27.1±0.1Wo1.9±0.2 (n=3). Plagioclase An10.0Ab84.8Or5.3 (n=2). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 270 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 3 out of about 1800 LL chondrites have a higher Fa content (NWA 10462, NWA 11776, and NWA 12334, all classified as LL6-anomalous). Magnetic susceptibility is also lower than in other moderaltely weathered LL chondrites. The opaque mineralogy, featuring magnetite and pentlandite, is also unusual for a LL chondrite.

Specimens: Type specimen at CEREGE. Main mass with Labenne.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):285
Fayalite (mol%):33.6±0.2 (n=4)
Ferrosilite (mol%):27.1±0.1 (n=3)
Wollastonite (mol%):1.9±0.2
Magnetic suscept.:3.24
Classifier:L. Krämer Ruggiu, J. Gattacceca CEREGE
Type spec mass (g):23.3
Type spec location:CEREGE
Main mass:Labenne
Comments:work name LL84; submitted by Jérôme Gattacceca
Plots: O isotopes:  
   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)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Gattacceca J., McCubbin F. M., Grossman J., Bouvier A., Bullock E., Chennaoui Aoudjehane H., Debaille V., D’Orazio M., Komatsu M., Miao B. and Schrader D. L. (2021) The Meteoritical Bulletin, No. 109. Meteoritics & Planetary Science 56, 1626–1630.
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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