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Northwest Africa 7915
Basic information Name: Northwest Africa 7915
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7915
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 415 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  LL5
Recommended:  LL5    [explanation]

This is 1 of 3148 approved meteorites classified as LL5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 25 Jun 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7915 (NWA 7915)

Morocco

Purchased: 2010

Classification: Ordinary chondrite (LL5)

History: Purchased by T. Jakubowski from Moroccan dealer in Erfoud; 69 g was cut off and studied by M. Brawata as part of an MSc project supervised by R. Kryza.

Physical characteristics: Single stone (415 g) covered by black fusion crust with rollover lips preserved at one side.

Petrography: Chondrule types include PO, BO, RP, CC, GOP; mostly well-defined. Chondrule diameters 0.4 to 4.0 mm, average 0.96 mm. Opaque minerals (15 vol %) include troilite, taenite and rare chromite. Kamacite replaced by iron hydroxide. Taenite grains slightly weathered. Small feldspar grains discernable in electron image; accessory apatite. Rare planar fractures in olivine and pyroxene; undulatory extinction of pyroxene in radial-pyroxene chondrules.

Geochemistry: (R. Kryza, M.Brawata and J. Ćwiąkalski, WrocU): Olivine Fa29.1, pyroxene Fs24.1Wo2.0, feldspar An24.7Ab71.9Or3.5, chromite (Mg0.1Fe2+0.96Mn0.01Zn0.01Si0.02Ti0.1) (Al0.23, Fe3+0.02Cr1.52)O4 and taenite with 25.50 wt% Ni and Co 1.67 wt%.

Classification: Ordinary chondrite LL5 S2 W3

Specimens: Main mass is held by T. Jakubowski. 42 g and three thin sections at WrocU.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2010
Mass (g):415
Pieces:1
Class:LL5
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):29.1±1.3 (N=6)
Ferrosilite (mol%):24.1±0.3 (N=3)
Wollastonite (mol%):2.0±0.4 (N=3)
Classifier:M. Brawata, R. Kryza, J. Cwiakalski (WrocU); T. Jakubowski, T.A. Przylibski and K. Luszczek (UTWroc.)
Type spec mass (g):42
Type spec location:WrocU
Main mass:T. Jakubowski
Comments:Submitted by M. Brawata
Institutions
   and collections
UTWroc: Wroclaw University of Technology, Faculty of Geoengineering Mining and Geology, Institute of Minings, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland (institutional address)
WrocU: Wroclaw University, Institute of Geological Sciences, ul. Cybulskiego 30, 50-205 Wroclaw, Poland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1459 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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