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Northwest Africa 13849
Basic information Name: Northwest Africa 13849
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13849
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 474 g
Recommended:  R3-6    [explanation]

This is 1 of 30 approved meteorites classified as R3-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 8 Apr 2021
Writeup from MB 110:

Northwest Africa 13849 (NWA 13849)

(Northwest Africa)

Purchased: January, 2021

Classification: Rumuruti chondrite (R3-6)

History: The meteorite was purchased from a dealer in Morocco.

Physical characteristics: Ten dark grayish fragments some of which partly covered by fusion crust.

Petrography: The meteorite displays a fresh dark grayish interior and is a breccia composed of up to 3 mm sized angular to subrounded type 6 and black impact melt clasts in abundant type 3 matrix. Ferroan olivine and nests of sodic plagioclase are the most abundant mineral phases in the clasts. Compositionally unequilibrated olivine and low-Ca pyroxene are dominant in matrix chondrules and among matrix mineral fragments. Chondrules have an average diameter of about 450 μm. In the matrix, sodic plagioclase occurs as small isolated grains. Opaques phases are sulfides and Ti-bearing chromite; metal is absent.

Geochemistry: type 3 lithology: olivine: Fa26.2±10.5 (Fa15.2-45.4, n=10); low-Ca pyroxene: Fs17.3±7.7Wo0.8±0.3 (Fs5.4-29.0Wo0.3-1.3, n=12); Ca-pyroxene: Fs11.0±0.9Wo44.9±0.8 (Fs8.9-12.4Wo43.0-46.0, n=8); type 6 lithology: olivine: Fa37.1±0.2 (FeO/MnO=73±5, n=7); Ca-pyroxene: Fs10.4±0.3Wo45.9±0.3, n=8

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021 Jan
Mass (g):473.7
Shock stage:S2
Weathering grade:low
Fayalite (mol%):26.2; 37.1
Ferrosilite (mol%):17.3; 11.0; 10.4
Wollastonite (mol%):0.8; 44.9; 45.9
Classifier:A. Greshake, MNB
Type spec mass (g):22.2
Type spec location:MNB
Main mass:Hanno Strufe and Andreas Grünemeyer
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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