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Northwest Africa 7610
Basic information Name: Northwest Africa 7610
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7610
Observed fall: No
Year found: 2009
Country: Morocco
Mass:help 1086 g
Meteoritical Bulletin:  MB 101  (2012)  LL5-6
Recommended:  LL5-6    [explanation]

This is 1 of 64 approved meteorites classified as LL5-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 10 Dec 2012
Writeup from MB 101:

Northwest Africa 7610 (NWA 7610)


Purchased: 2009

Classification: Ordinary chondrite (LL5-6)

History: One partially crusted stone weighing 1086 g was purchased in Agadir in 2008. Greg Catterton acquired the sample from a meteorite prospector in 2009.

Physical characteristics: Dark blackish-brown matte fusion crust covers approximately 75% of the stone. The fusion crust covers one side of the cubic-shaped stone and contains several moderately-developed regmaglypts

Petrography: (Anthony Love, App): Sample displays brecciated structure containing chondrules and chondrule fragments and light and dark-colored clasts of various petrologic grades set within an oxidized fine-grained fragmental matrix. Clasts display weakly to totally recrystallized chondritic textures and shock-darkened and shock melted textures. Chondritic host rock contains well-defined type IIA, IIB and IIAB chondrules, rare Al-rich chondrules with chrome spinel, poikilitic olivine-pyroxene chondrules and fragments. Host chondrules have an average diameter of 0.7 mm. Porphyritic chondrules display turbid and devitrified mesostasis. Some porphyritic pyroxene chondrules contain clinoenstatite. Some chondrules display rims of FeO (relict FeNi,FeS), making them distinct from matrix.

Geochemistry: (A. Love, App) Olivines Fa31.4±1.3, PMD=2.9 n=24. Pyroxenes Fs24.5Wo2.6, PMD-FeO=3.0, PMD-CaO=31.2, n=18. Plagioclase An20.6, PMD=63.9 n=13

Classification: LL5-6

Specimens: a total of 57.34 g and 4 thin sections are on deposit at App

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2009
Mass (g):1086
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):31.4±1.3
Ferrosilite (mol%):24.5
Wollastonite (mol%):2.6
Classifier:A. Love, App
Type spec mass (g):57.34
Type spec location:App
Main mass:Greg Catterton
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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     This is 1 of 1973 approved meteorites from Morocco (plus 37 unapproved names) (plus 1 impact crater)

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