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Northwest Africa 11405
Basic information Name: Northwest Africa 11405
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11405
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 54.5 g
Meteoritical Bulletin:  MB 106  (2018)  R3-4
Recommended:  R3-4    [explanation]

This is 1 of 11 approved meteorites classified as R3-4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 11 Sep 2017
Writeup from MB 106:

Northwest Africa 11405 (NWA 11405)

(Northwest Africa)

Purchased: 2017

Classification: Rumuruti chondrite (R3-4)

History: One partially crusted stone weighing 54.5 g was found in Morocco prior to 2017. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February 2017.

Physical characteristics: Sample is tabular in shape, dark brownish-green in color and contains one patch (~25% of surface) of weakly magnetic fusion crust that appears to be the bubbled trailing edge of an oriented stone. The interior is brownish-orange in color and has a clastic texture composed of chondritic clasts (some dark-colored) within a host of chondrules and fragments. No metal or sulfide is visible on the surface.

Petrography: Description and classification (A. Love, App): Sample is a breccia composed of up to 15 mm clasts set within a host of well-defined chondrules (avg. dia. 353 μm) and fragments. Unequilibrated clasts contain chondrules with zoned olivine and pyroxene set within fine-grained matrix. Olivine chondrules display normal extinction and irregular fractures. Clinoenstatite is present. Within equilibrated clasts: olivines have uniform compositions; low and high Ca-pyroxenes are present; plagioclase occurs as isolated intergrowths and as networks similar to those found in type 4 and 5 R-chondrites. These components are hosted within a recrystallized matrix. Fine-grained FeS grains occur within some chondrules. Sulfides where present within matrix, are corroded and rare. Accessory minerals chromite.

Geochemistry: (A. Love, App) Olivine (Host: Fa0.4-43.0, mean Fa23.7±13.7 CV=58%, N=21; Equilibrated clasts Fa38.5±0.1, N=6), Fe/Mn=75.6, NiO=0.1±0.2; Orthopyroxene (Host: Fs5.7-30.1Wo0.3-13.5, mean Fs17.9±8.2Wo2.6±3.1, N=16; Equilibrated clast Fs22.8Wo2.33, N=1); High-Ca pyropxene (Equilibrated clasts: Fs10.2±0.5Wo46.4±0.6, N=5).

Classification: Rumuruti chondrite (R3-4, S1, W2). Based on Fa, Fe/Mn and Ni-bearing compositions of olivines, chondrule diameter and texture this sample is a Rumuruti chondrite. Based on the coefficient of variation of olivines within unequilibrated clasts, the petrologic subtype is estimated at 3.4.

Specimens: PARI holds the main mass. One 11.04 g endcut and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):54.5
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):23.7±13.7; 38.5±0.14
Ferrosilite (mol%):17.9±8.2; 22.8
Wollastonite (mol%):2.6±3.1; 2.3
Classifier:A. Love, App
Type spec mass (g):11.0
Type spec location:App
Main mass:PARI
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
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 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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