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Northwest Africa 3100
Basic information Name: Northwest Africa 3100
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3100
Observed fall: No
Year found: 2003
Country: Morocco
Mass:help 136 g
Classification
  history:
Meteoritical Bulletin:  MB 89  (2005)  Achondrite-prim
MetBase:  v. 7.1  (2006)  Achondrite-ung
Recommended:  Achondrite-prim    [explanation]

This is 1 of 14 approved meteorites classified as Achondrite-prim.   [show all]
Search for other: Primitive achondrites
Writeuphelp
Writeup from MB 89:

Northwest Africa 3100

Morocco

Purchased 2003 June

Primitive achondrite

A 136 g complete stone with weathered crust was purchased in Rissani.  Description and classification (T. Bunch and J. Wittke, NAU): polygonal-granular, fine-grained (avg. size 0.155 mm; range, 0.03 to 0.7 mm), thoroughly recrystallized (two very small relict chondrules were observed in one of two thin sections).  Mineral modes (vol%): olivine, 78; orthopyroxene, 10; plagioclase, 5; troilite, 5; metal, 1; chromite, diopside and merrillite all <1; olivine is greatly enhanced and metal is depleted relative to LL6 chondrites.  Olivine, Fa28.7 (FeO/MnO = 65.6; orthopyroxene, Fs23.5Wo0.8. (FeO/MnO = 48.8); plagioclase, An34.1Or3.1; diopside, Fs12.8Wo41; Ni-rich troilite, Ni = 4.2 wt%; metal (taenite only), Ni = 20.1 wt%; chromite, Cr/(Cr+Al) = 0.80, Mg/(Mg+Fe) = 0.21. Shock stage, S1; weathering grade, W2.  Oxygen isotopes: replicate analyses of an acid-washed whole rock sample by laser fluorination (T. Larson and F. Longstaffe, UWO) gave respectively d18O = 1.54, 1.15‰, d17O = -0.92, -1.07‰, D17O = -1.72, -1.66‰, which imply that this specimen has affinities with CR chondrites (Bunch et al., 2005).  Specimens: type specimens, 20.2 g, and two polished thin sections, NAU; main mass, MFarmer.

Data from:
  MB89
  Table 7
  Line 441:
Origin or pseudonym:Morocco
Place of purchase:Rissani
Date:2003
Mass (g):136
Pieces:1
Class:Primitive achondrite
Classifier:
Type spec mass (g):20.2
Plots: O isotopes:  
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 2015)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Collection FABIEN/FRANÇOIS-XAVIER KUNTZ/FLOTTERER   
Don Edwards   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
David Campbell   
Gerald Armstrong   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1459 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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