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Northwest Africa 6901 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 6901 This is an OFFICIAL meteorite name. Abbreviation: NWA 6901 Observed fall: No Year found: 2011 Country: (Northwest Africa) Mass: 1197 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 16 approved meteorites classified as Achondrite-prim. [show all] Search for other: Primitive achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 22 Dec 2011 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 100:
Northwest Africa 6901 (NWA 6901) (Northwest Africa) Purchased: May 2011 Classification: Primitive achondrite History: Purchased in Morocco in May 2011. Physical characteristics: Greenish, wind-polished, 1197 g stone. Small patches of dull black fusion crust remain. Large, dark green olivine and orthopyroxene grains scattered throughout and range in size from a few to 40 mm. Petrography: (J. Zipfel, Senck) Exhibits recrystallized porphyroblastic to poikiliblastic texture with rare porphyroclasts and abundant indistinct chondrules (BO dominate). Grain boundaries are irregular and strongly embayed. Grain sizes 0.04 to 1.2 mm. Modal analyses (in vol.%): olivine=55, orthopyroxene=36, clinopyroxene=0.6, plagioclase=2, merrillite=0.4, FeS=3, chromite=1 and metal=3. Geochemistry: Olivine (Fa36.4, Fe/Mn=90), orthopyroxene (Fs29.0Wo3.0, Fe/Mn=57), clinopyroxene (Fs12.8Wo42.8), plagioclase (An47.1Or1.0, FeO=0.56 wt.%); chromite (cr#=71.7, TiO2=1.3 wt.%, MgO=3.1 wt.%), rare kamacite (Ni=6.6 wt.%), abundant taenite (Ni=17.8-21.1 wt.%) and rare tetrataenite (Ni=51.4 wt.%). Oxygen isotopes: (A. Pack, UGött) Analyses by laser fluorination gave: δ17O = -0.25; δ18O = 2.77, Δ17O = -1.69 (all per mil) and plot in the CR field. Classification: Primitive achondrite; unshocked, minimal weathering. Potentially paired with NWA 2994 and NWA 3250. Specimens: A total of 22 g is on deposit at Senck. The main mass holder is anonymous. | ||||||||||||||||||||||||||||||
Data from: MB100 Table 1 Line 1527: |
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Plots: | O isotopes: | ||||||||||||||||||||||||||||||
Institutions and collections |
Senck: SENCKENBERG Forschungsinstitut und Naturmuseum Frankfurt
Senckenberganlage 25
60325 Frankfurt am Main
Germany, Germany (institutional address; updated 4 Apr 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
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Revision history: |
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