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Northwest Africa 7660
Basic information Name: Northwest Africa 7660
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7660
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 23 g
Meteoritical Bulletin:  MB 103  (2014)  LL-melt rock
Recommended:  LL-melt rock    [explanation]

This is 1 of 12 approved meteorites classified as LL-melt rock.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 30 May 2014
Writeup from MB 103:

Northwest Africa 7660 (NWA 7660)


Purchased: Oct 2011

Classification: Ordinary chondrite (LL, melt rock)

Petrography: (C.A. Lorenz, Vernad) The meteorite is fine- to medium-grained with a poikilitic, partly recrystallized texture. The rock is dominated by olivine and orthopyroxene, with minor feldspar and numerous inclusions of FeNi metal, troilite and pentlandite. Accessory phases are clinopyroxene and Ca-phosphate.

Geochemistry: (N.N. Kononkova, Vernad): olivine Fa30.7 (Fe/Mn = 96); pyroxene Fs25.1 Wo3.6 (Fe/Mn = 55); feldspar Ab73.0An24.7; FeNi metal Ni = 66.43, Co = 1.97 (all in wt%). Oxygen isotopic composition by laser fluorination (I.A. Franchi, OU) δ17O = 3.874; δ18O = 4.964, Δ17O = 1.293 (all per mil).

Classification: LL-melt rock is based on very fine-grained poikilitic aggregate of olivine, orthopyroxene and plagioclase 5-50 μm, which is inconsistent with typically coarser-grained LL7. Fe/Mn in olivine and pyroxene is anomalously high for LL. Ni in metal (awaruite), is similar to that in Parambu (LL5).

Data from:
  Table 0
  Line 0:
Place of purchase:Munich, Germany
Date:P Oct 2011
Mass (g):23
Class:LL-melt rock
Weathering grade:W2
Fayalite (mol%):30.7
Ferrosilite (mol%):25.1
Wollastonite (mol%):3.6
Classifier:C. A. Lorenz, Vernad
Type spec mass (g):4.7
Type spec location:Vernad
Main mass:DMUH
Comments:Submitted by C.A. Lorenz
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Vernad: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russia (institutional address; updated 21 Feb 2016)
DMUH: Dedovsk Museum of Universe History, Russia; Website (institutional address; updated 26 Sep 2011)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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     This is 1 of 2089 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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