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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
Classification
  history:
Recommended:  LL6-an    [explanation]

This is 1 of 5 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
Writeuphelp
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:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):285
Pieces:1
Class:LL6-an
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:  
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7675 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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