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Northwest Africa 6716
Basic information Name: Northwest Africa 6716
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6716
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 293 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Iron, IIE 
Recommended:  Iron, IIE    [explanation]

This is 1 of 14 approved meteorites classified as Iron, IIE.   [show all]
Search for other: IIE irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 6 Jun 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6716 (NWA 6716)

(Northwest Africa)

Purchased: 2010 Aug

Classification: Iron meteorite (IIE)

History: A single iron mass was purchased from a Moroccan dealer in August 2010 by M. Graul, Bernau, Germany.

Physical characteristics: The 293 g wedge-shaped mass measures 110 × 35 × 5-30 mm and has a glossy-brown external surface.

Petrography: (M. D’Orazio, A. Fazio, DST-PI) Etched section show a polycrystalline texture composed of 0.1 to 2 mm grains of kamacite often showing 120° triple junctions and Neumann bands. Ghosts of the pre-existing Widmannstätten pattern (bandwidth = 1.5±0.2 mm) visible. Plessitic fields showing comb-net texture are preserved. The sections show three large (to 4.5 mm) rounded inclusions of Cl-rich Ca-phosphate, with rims of Cl-free Ca-Mg-Na-phosphate and tiny inclusions of Cl-free Mg-Ca-Fe-Na-Mn phosphate. Schreibersite is relatively common as elongated (to 8 mm) skeletal crystals. A well-preserved heat-alteration zone is marked by an 1.5-2.0 mm-thick band showing serrated texture and grain-size (50-100 μm) significantly smaller that the meteorite interior. Terrestrial weathering is low.

Geochemistry: Composition of the metal (ICP-MS; D’Orazio and Folco, 2003) is Co=0.422, Ni=7.77 (both in wt%), Cu=147, Ga=24.3, Ge=62, Ir=4.4, Au=0.97 (all in ppm).

Classification: IIE iron meteorite, recrystallized coarse octahedrite.

Specimens: A 12.7 g etched end cut and a 9.3 g polished full slice are on deposit at DST-PI. MGraul holds the main mass.

Bibliography:
  • D'Orazio M. and Folco L. (2003) Chemical analysis of iron meteorites by inductively coupled plasma-mass spectrometry. Geostand. Newslett. 27, 215-225. (link)
Data from:
  MB100
  Table 1
  Line 1493:
Date:P 2010 Aug
Mass (g):293
Pieces:1
Class:Iron, IIE
Classifier:Massimo D'Orazio, DST-PI
Type spec mass (g):20.0
Type spec location:DST-PI
Main mass:MGraul
Comments:Submitted by Massimo D'Orazio, DST-PI
Institutions
   and collections
DST-PI: Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 56126 Pisa, Italy (institutional address; updated 17 Oct 2011)
MGraul: Mr. Mirko Graul, Quittenring 4, D-16321 Bernau, Germany (private address; updated 24 May 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Gregor H.   
ironee   
Mirko Graul            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6752 approved meteorites from (Northwest Africa) (plus 2052 unapproved names)

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