31.09g LL3.5 Type 3 Chondrite End Piece
|Northwest Africa 7981|
Name: Northwest Africa 7981
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7981
Observed fall: No
Year found: 2013
Mass: 110.9 g
This is 1 of 22 approved meteorites classified as LL3.5.
|Comments:||Approved 12 Sep 2013|
Writeup from MB 102:
Northwest Africa 7981 (NWA 7981)
Classification: Ordinary chondrite (LL3.5)
History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to Sean Tutorow for classification, 2012.
Physical characteristics: Single stone, dark weathered fusion crust, saw cut reveals many chondrules of variable size, some up to 5 mm, set in a reddish brown matrix.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated porphyritic chondrules, most with glass or mesostasis.
Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa26.8±8.5, Fe/Mn=73±21, Cr2O3=0.08±0.19 wt%, range Cr2O3=0.01-0.96 wt%, CaO=0.08±0.06 wt%, n=29; low-Ca pyroxene Fs20.0±7.5Wo2.7±2.8, Fe/Mn=31±18, n=17.
Classification: Ordinary chondrite (LL3.5). Weathering grade W2.
Specimens: 20.9 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.
|UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; (institutional address; updated 12 Feb 2015)|
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