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Northwest Africa 13077
Basic information Name: Northwest Africa 13077
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13077
Observed fall: No
Year found: 2016
Country: Morocco
Mass:help 70 g
Classification
  history:
Recommended:  R3-5    [explanation]

This is 1 of 24 approved meteorites classified as R3-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 31 Jan 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13077 (NWA 13077)

Morocco

Purchased: 2016

Classification: Rumuruti chondrite (R3-5)

History: Purchased by Said Yufsi in 2016 from a moroccan dealer in Dakhla city. Later acquired by Roberto Vargas.

Physical characteristics: Single stone with dark-brown fusion crust.

Petrography: (D. Sheikh, FSU) This sample is a breccia composed of well-formed chondrules (Av. diameter ~500 μm) and an assortment of equilibrated angular clasts (up to 4 mm) set in a fine-grained matrix. Minerals present include olivine, orthopyroxene, augite, sodic plagioclase, pentlandite, troilite, and Ti-rich chromite.

Geochemistry: Olivine in equilibrated clasts (Fa38.7±0.7, n=70), olivine in unequilibrated chondrules (Fa23.3±16.8, range Fa3.7-44.5, n=20) orthopyroxene in equilibrated clasts (Fs29.6±0.3 Wo1.5±0.4, n=10) orthopyroxene in unequilibrated chondrules (Fa21.3±12.7 Wo1.2±0.6, range Fs1.4-29.9 Wo0.1-1.9, n=10), augite (Fs11.8±1.5 Wo44.1±1.1, n=30), sodic plagioclase (An11.6±4.7, range An6.6-22.3, n=20).

Classification: Rumuruti chondrite (R3-5). This sample is classified as an R3-5 due to the fact that it contains both type 3 unequilibrated chondrules and type 5 equilibrated clasts with recrystallized plagioclase grain size at ~20 µm.

Specimens: 14.2 grams at UCLA; main mass with Roberto Vargas.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):70
Pieces:1
Class:R3-5
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):38.7±0.7
Ferrosilite (mol%):29.6±0.3
Wollastonite (mol%):1.5±0.4
Classifier:D. Sheikh, FSU
Type spec mass (g):14.2
Type spec location:UCLA
Main mass:Roberto Vargas
Comments:Submitted by Daniel Sheikh
Institutions
   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)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh      
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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