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Northwest Africa 11587
Basic information Name: Northwest Africa 11587
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11587
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 714 g
Classification
  history:
Recommended:  R3-5    [explanation]

This is 1 of 13 approved meteorites classified as R3-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 3 Feb 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11587 (NWA 11587)

(Northwest Africa)

Purchased: 2017

Classification: Rumuruti chondrite (R3-5)

History: A single stone weighing 714 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 of 2017.

Physical characteristics: Sample is dark brown and has a rounded shape with an irregular surface composed of pits and protrusions. The cut face shows the sample is a breccia composed of 3-4 distinct chondritic lithologies that are light orange to dark-brown in color.

Petrography: Description and classification (A. Love, App): Sample is a breccia composed of 0.5-4 cm unequilibrated equilibrated chondritic clasts (type 4-5) and a shock-darkened, unequilibrated lithology set within a host of unequilibrated chodrules, fragments and fragmental matrix. Chondrules in host and clasts have an average diameter of 340 μm (n=81). Additional minerals are: apatite, FeS, pentlandite and chromite.

Geochemistry: (A. Love, App) Type 5: Olivine (Fa38.9±0.3, Fe/Mn=76.1, N=6); high-Ca pyroxene (Fs 11.1±0.9Wo45.9±1.0, N=6); low-Ca pyroxene (Fs30.5±0.6Wo4.12/-2.8, n=2). Type 3: Olivine (Fa13.7±9.9, range Fa0.4-33.8, CV=72%, Fe/Mn=2.3-85.6, N=36, Cr2O3 in ferroan olivine 0.2±0.1, N=22); low-Ca pyroxene Fs12.2±9.7Wo1.6±1.2 (Fs0.7-31.7Wo0.3-4.1, N=15).

Classification: Rumuruti chondrite (R3.2-5, S3, wi-2). Based on Fa and Fe/Mn compositions of olivines, chondrule diameter and texture this sample is a Rumuruti chondrite breccia. Based on the coefficient of variation of olivines within unequilibrated clast, the petrologic subtype is estimated at 3.2 (Bischoff, 2000).

Specimens: PARI holds the main mass. One 20.2g endcut and a polished thin section are on deposit at App.

Bibliography:
  • Bischoff, A. (2000) Mineralogical characterization of primitive, type-3 lithologies in Rumuruti chondrites. Meteorit. Planet. Sci. 35 699-706 (link)
Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral show
Date:P 2017
Mass (g):714
Pieces:1
Class:R3-5
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):38.9±0.3 (n=6); 13.7±9.9 (n=36)
Ferrosilite (mol%):11.1±0.9 (n=6); 12.2±9.7 (n=15)
Wollastonite (mol%):45.9±1.0; 1.6±1.2
Classifier:A. Love, App
Type spec mass (g):20.2
Type spec location:App
Main mass:PARI
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6551 approved meteorites from (Northwest Africa) (plus 2022 unapproved names)

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