Type 3 | H 3.10 Unequilibrated Stoney Meteorite | 1 of 3 | NWA 8061
|Northwest Africa 8061|
Name: Northwest Africa 8061
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8061
Observed fall: No
Year found: 2013
Mass: 876 g
This is 1 of 3 approved meteorites classified as H3.10. [show all]
Search for other: H chondrites (type 3), H chondrites, Ordinary chondrites (type 3), and Ordinary chondrites
|Comments:||Approved 5 Dec 2013|
Writeup from MB 102:
Northwest Africa 8061 (NWA 8061)
Classification: Ordinary chondrite (H3.10)
History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, 2013.
Physical characteristics: 21 fragments that fit together to form 3 matching stones. Weathered exterior, saw cuts on all fragments reveal the same reddish brown interior, with small chondrules visible.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows many distinct, porphyritic chondrules, most with glass or mesostasis, also some irregular shaped or fragmental chondrules. Apparent mean chondrule size 286±225 μm, median 200 μm, n=70. Some of the abundant iron metal appears to be oxidized a seen in the widespread oxide veining. Opaque matrix throughout. Accessory melilite, fassaite, sulfide, chromite.
Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Chondrule ferroan olivine Fa14.9±6.2, Fe/Mn=46±24, Cr2O3=0.34±0.11 wt%, n=21; chondrule olivine range Fa0.3-26.8, n=33; low Ca-pyroxene Fs10.5±8.2Wo1.7±1.7, Fe/Mn=25±25, n=24. (Karen Ziegler, UNM) Oxygen isotope values of 4 acid-washed aliquots of bulk sample, 1.3, 1.4, 1.4, 1.7 g, gave δ17O = 3.676, 3.040, 3.434, 3.139, δ18O = 5.521, 5.632, 6.320, 5.652, Δ17O = 0.761, 0.066, 0.097, 0.155 (linearized, all permil).
Classification: Ordinary chondrite (H3.10). Type 3.10 is based on mean Cr2O3 content and sigma of ferroan olivine in porphyritic chondrules using the scheme of Grossman and Brearley (2005). The sigma of 0.11 is anomalously low compared to other 3.10 ordinary chondrites, and instead resembles the mean Cr2O3 and sigma of Colony, Y-81020 (CO3.1), and Acfer 094 (C2-ung). Weathering W2.
Specimens: 25.1 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.
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