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Northwest Africa 14542
Basic information Name: Northwest Africa 14542
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14542
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 523 g
Recommended:  R3    [explanation]

This is 1 of 63 approved meteorites classified as R3.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 12 Feb 2022
Writeup from MB 111:

Northwest Africa 14542 (NWA 14542)

(Northwest Africa)

Purchased: 2021 Aug

Classification: Rumuruti chondrite (R3)

Physical characteristics: Crusted stone. Cut surface reveals a dark interior with grayish chondrules set in an abundant dark matrix.

Petrography: (J. Gattacceca, CEREGE) Brecciated chondrite with well-delineated chondrules, mostly porphyritic type and less commonly radial pyroxne and barred olivine types, with apparent diameter 530±240 µm (n=31) set in an abundant iron-rich fine grained matrix (68 vol% by point counting, n=248). Sulfides, both troilite and pentlandite, are abundant in the matrix where they form spherical grains to 500 µm, in chondrules, and around chondrule rims (5 vol% by point counting, n=248). Magnetite is less abundant and associated with sulfides. No metal was observed. No CAI was observed.

Geochemistry: Olivine Fa31.6±9.7, range Fa14.7-42.7, FeO/MnO 82.9±27.2, Cr2O3 0.30±0.42 wt%, NiO 0.18±0.13 wt%(n=15). Matrix olivine Fa51.5 (n=1). Low-Ca pyroxene Fs15.1±7.7Wo1.0±0.6 (n=4). Magnetite Cr2O3 0.86 wt% (n=2). Defocused matrix FeO 42.3 wt%, analytical total 100.3 wt%.

Classification: Rumuruti chondrite (R3)

Specimens: Type specimen at CEREGE, main mass with Pierre-Marie Pelé.

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmim
Date:P 2021 Aug
Mass (g):522.5
Weathering grade:low
Fayalite (mol%):31.6±9.7 (n=15)
Ferrosilite (mol%):15.1±7.7 (n=4)
Wollastonite (mol%):1.0±0.6
Magnetic suscept.:3.28
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):24.1
Type spec location:CEREGE
Main mass:Pierre-Marie Pelé
Comments:work name PM21-1; submitted by Jérôme Gattacceca
   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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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