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Northwest Africa 11047
Basic information Name: Northwest Africa 11047
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11047
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 51 g
Meteoritical Bulletin:  MB 106  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 7 Feb 2017
Writeup from MB 106:

Northwest Africa 11047 (NWA 11047)

Northwest Africa

Purchased: 2015

Classification: Ureilite

History. On 2015, meteorite specimens were purchased by José Antonio Sanchez Santana in the Saharawi refugee camps in Tindouf, Algeria.

Physical characteristics. Rounded reddish-brown single stone with a mass of 51 g with black fusion crust covering 15% of the stone was found in the desert. A saw cut reveals dark polycrystalline texture.

Petrography: Petrographic description (R. P. Lozano, IGME). Polished section shows typical ureilitic equigranular texture with interlocked euhedral to subhedral olivine and pigeonite grains, 0.5 to 2 mm in size and abundant 120° triple junctions. Grain boundaries are marked by a concentration of carbonaceous material and trace amounts of troilite, nickel-iron (partly altered to terrestrial oxides), Ca-rich pyroxene and schreibersite. Olivines surrounded by reduction rims depleted in Fe (50 to 100 μm in thickness).

Geochemistry: Mineral compositions (Rafael Pablo Lozano, IGME). Microprobe analyses show pigeonite ranges from Fs1-17Wo1-8 with a mean of Fs9.8±9.7Wo6.8±1.9 and Fe/Mn=6-34 (mean Fe/Mn=13.8±11.3) (n=18). Olivine range is: Fo77-81 (mean: Fo78.2±2.4; n=15) with Fe/Mn=38-70 (mean Fe/Mn=50.3±5.0). Ca-rich pyroxene ranges are Fs2-4Wo23-37 (means: Fs2.5±1.0Wo33.4±5.6) and Fe/Mn=3-5 (mean: Fe/Mn=4.0±0.7) (n=5). The metal is kamacite with Ni=4.3-6.8 and Co=0.4-0.5 (all in wt.%; n=12). Troilite contains Cr (0.9-4.6), Mn (0.1-0.6) and Ni (0.1-0.5) (all in wt.%; n=9). Bulk chemistry (J. Reyes, IGME). 0.5 grams of sample for analysis. XRF of subsample gave abundances of (in wt.%): SiO2=38.5, TiO2<0.30, Al2O3=<0.60, Fe2O3=20.8, MgO=33.5, CaO=1.11 and K2O<0.40. Na2O= 0.09 wt.% by AAS. Trace elements were measured with ICP-MS (all in ppm): Be<0.1, V=83, Cr=3864, Co=113, Ni=1570, Cu=15.1, Zn=246, As=0.37, Se=2, Mo<0.5, Ag<0.1, Cd<0.5, Sb<0.1, Ba=20.2, Tl<0.1, Pb=2.77, Th=0.1 and U<0.1.

Classification (R.P. Lozano, IGME). Achondrite, ureilite. Terrestrial weathering is moderate with partial oxidation of metal.

Specimens. Type specimen (10.2 g) and a probe mount are on deposit at IGME, and 12.0 g at UCLA. José Antonio Sánchez Santana holds the main mass (Private address: C/ Río Añamaza, nº 4, Torremolinos, 29620, Málaga, Spain).

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P 2015
Mass (g):51
Weathering grade:moderate
Fayalite (mol%):20.9±2.2 (N=15)
Ferrosilite (mol%):9.8±9.7 (N=18); 2.5±1.0 (N=5)
Wollastonite (mol%):6.8±1.9; 33.4±5.6
Classifier:R.P. Lozano, IGME
Type spec mass (g):10.2
Type spec location:IGME
Main mass:José Antonio Sánchez Santana (Private address: C/ Río Añamaza, nº 4, Torremolinos, 29620, Málaga, Spain)
Comments:Submitted by Rafael Pablo Lozano Fernández
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
IGME: Museo Geominero, Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain (institutional address; updated 12 Dec 2012)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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