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Northwest Africa 11174
Basic information Name: Northwest Africa 11174
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11174
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 7.41 kg
Meteoritical Bulletin:  MB 106  (2018)  H5
Recommended:  H5    [explanation]

This is 1 of 10308 approved meteorites (plus 45 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Feb 2017
Writeup from MB 106:

Northwest Africa 11174 (NWA 11174)

(Northwest Africa)

Find: 2010

Classification: Ordinary chondrite (H5)

History: A small strewnfield comprising 21 complete stones was found by nomads in 2010, purportedly in eastern Morocco. The stones were acquired by a dealer in Erfoud, Morocco, and subsequently by Aerolite Meteorites Inc of Tucson, Arizona. The stones range in size from 51.4 to 1289 g, with a total combined mass of 7411.1 g.

Physical characteristics: All stones display brownish fusion crust, in places still black and well-preserved, and some show small, well-formed regmaglypts. Several stones were sawn in half; all display a similar pattern of small chondrules and even distribution of small metal and sulfide grains. One stone contains a 4-mm-thick vein of metal and troilite. Interior is light colored with patchy iron-oxide staining. No shock veins visible.

Petrography: (K. Domanik, UAz, L Garvie, ASU) Microprobe examination of a polished thin section shows a few well-delineated, equilibrated chondrules set in a matrix composed of indistinct chondrules, recrystallized chondrules, and larger (to 500 μm) kamacite and troilite grains. Recognizable chondrules include BO, PP, PO, CC, and RP. Feldspar abundant, many grains to 60 μm. Kamacite fresh showing only minor oxidation. Troilite are polycrystalline and many show a "frothy" texture, with abundant sub-micron inclusions. Kamacite is single crystal with most grains showing Neumann bands: many of these bands show distinct curvature. Less common grains with tetrataenite rims and dark-etched plessitic cores. Other minerals include chromite, Cl-apatite, merrillite, and minor taenite.

Geochemistry: Olivine Fa19.1±0.4, Fe/Mn=38±2, n=20, low-Ca pyroxene Fs16.5±0.4Wo1.3±0.1, Fe/Mn=23±1, n=17, Plagioclase Ab84±0.7An10.8±0.6Or5.2±0.9, n=5, Kamacite 6.87 wt% Ni±0.08, n=8.

Classification: Ordinary chondrite (H5), W1, S3

Specimens: 382 g stone at ASU.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Mass (g):7411
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):19.1±0.4
Ferrosilite (mol%):16.5±0.4
Wollastonite (mol%):1.3±0.1
Classifier:L. Garvie, ASU, and K. Domanik, UAz
Type spec mass (g):382
Type spec location:ASU
Main mass:Aerolite Meteorites Inc.
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 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 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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