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Northwest Africa 6901
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:help 1197 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Achondrite-ungĀ 
Recommended:  Achondrite-prim    [explanation]

This is 1 of 13 approved meteorites classified as Achondrite-prim.   [show all]
Search for other: Primitive achondrites
Comments: Approved 22 Dec 2011
Writeuphelp
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:
Place of purchase:Quarzazte
Date:P May 2011
Mass (g):1197
Pieces:1
Class:Achondrite-prim
Shock stage:S1
Weathering grade:W0
Fayalite (mol%):36.4
Ferrosilite (mol%):29.0
Wollastonite (mol%):3.0
Classifier:J. Zipfel, Senck
Type spec mass (g):22
Type spec location:Senck
Main mass:anonymous
Comments:Submitted by J. Zipfel
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6984 approved meteorites from (Northwest Africa) (plus 2008 unapproved names)

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