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Northwest Africa 3164
Basic information Name: Northwest Africa 3164
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3164
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 928 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 33 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 16 Jan 2006
Revised 3 Feb 2006: Revised writeup
Writeuphelp
Writeup from MB 90:

Northwest Africa 3164

Morocco or Algeria

Find: August 2004

Achondrite (angrite)

History: In August 2004, A. Aaronson purchased many individual dark brown stones totaling 928 g from nomads in Rabat.

Petrography: (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS) All stones have irregularly distributed, larger yellowish plagioclase grains exhibiting a luster. The overall texture is granular, but there are large porphyroclasts of anorthite, spinel, and polygranular olivine. There are clinopyroxene-spinel symplectites around anorthite porphyroclasts in contact with olivine, and anorthite also occurs as narrow (10–20 µm wide) coronas around spinel grains adjacent to clinopyroxene.

Geochemistry: The major minerals are Ca-rich olivine

(Fa39.1–41.2; FeO/MnO = 62–84; CaO = 1.2–1.8 wt%), Al,Ti-bearing diopside (Fs10.3Wo52; FeO/MnO = 130–142; Al2O3 = 6–7, TiO2 = 1–1.6 [both wt%]), minor Cr-bearing pleonaste spinel (Mg/(Mg+Fe) = 45.7, Al2O3 = 59.7, Cr2O3 = 4.7 [both wt%]), almost pure anorthite (<0.02 wt% Na2O), and accessory kamacite and troilite. No kirschsteinite or orthopyroxene was found. Primary metal is partly replaced by limonite, which also occurs along grain boundaries.

Classification: Achondrite (angrite). Note: The sample may be paired with NWA 2999.

Specimens: A 21 g type specimen and one polished thin section are on deposit at NAU. Boswell holds the main mass.


Writeup from MB 91:

Northwest Africa 3164

Algeria

Find: 2004

Achondrite (angrite)

History: A. Aaronson purchased a bag of stones in Rabat, Morocco, in August 2004. T. Boswell then purchased these stones in Denver, Colorado, in September 2005.

Physical characteristics: A total of 48 stones with a combined mass of 928 g are all dark brown in color and without fusion crust.

Petrography (T. Bunch and J. Wittke, NAU; A. Irving and S. Kuehner, UWS) All stones have irregularly distributed larger yellowish plagioclase grains exhibiting a schiller luster. The major minerals are Ca-rich olivine, diopside, Cr-bearing pleonaste spinel with subordinate anorthite and spinel and accessory kamacite and troilite. No kirschsteinite or orthopyroxene was found. Primary metal is partly replaced by limonite, which also occurs along grain boundaries. The overall texture is protogranular, but there are large porphyroclasts of anorthite, spinel, and polygranular olivine. There are clinopyroxene-spinel symplectites around anorthite porphyroclasts in contact with olivine, and anorthite also occurs as narrow (10–20 µm wide) coronas around spinel grains adjacent to clinopyroxene (Kuehner et al. 2006).

Mineral compositions and geochemistry: Ca-rich olivine (Fa39.1–41.2; FeO/MnO = 62–84, CaO = 1.2–1.8 wt%), Al-Ti-bearing diopside (Fs10.3Wo52; FeO/MnO=130–142, Al2O3 = 6–7, TiO2 = 1–1.6 [both wt%]), Cr-bearing pleonaste spinel

(Mg/[Mg + Fe] = 45.7, Al2O3=59.7, Cr2O3=4.7 [both wt%]).

Classification: Achondrite (angrite). The characteristic textures and mineral compositions indicate that this material is likely paired with NWA 2999.

Type specimens: A total of 21 g and one polished thin section are on deposit at NAU. Boswell holds the main mass.

Data from:
  MB90
  Table 2
  Line 195:
Place of purchase:Rabat, Morocco
Date:Aug 2004
Mass (g):928
Pieces:many
Class:Ang
Type spec mass (g):21
Comments:Paired with NWA 2999
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Aeroliths Collection Theodossiou   
Gerald Armstrong   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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