Meteoritical Bulletin: Entry for Northwest Africa 7660

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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: 23 g

Classification
history:

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

help

Writeup from MB 103:

Northwest Africa 7660 (NWA 7660)

Morocco

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 Fa_30.7(Fe/Mn = 96); pyroxene Fs_25.1Wo_3.6(Fe/Mn = 55); feldspar Ab_73.0An_24.7; 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:
  MB103
  Table 0
  Line 0:

Place of purchase:	Munich, Germany
Date:	P Oct 2011
Mass (g):	23
Pieces:	1
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
Finder:	anonymous
Comments:	Submitted by C.A. Lorenz

Plots:

O isotopes:

Institutions
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)

Catalogs:

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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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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Revision
history:

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