NWA 14542 (R3)

 114.00 620.00

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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.

Place of purchase: Guelmim
Date: P 2021 Aug
Mass (g): 522.5
Pieces: 8
Class: R3
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
Finder: anonymous
Comments: work name PM21-1; submitted by Jérôme Gattacceca

Additional information

Weight N/A

11.47g, 17.65g, 18.06g, 24.52g, 25.25g, 42g, 60.6g, 82.4g, 95.9g