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Northwest Africa 4165
Basic information Name: Northwest Africa 4165
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4165
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 432 g
Meteoritical Bulletin:  MB 100  (2012)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 605 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 1 Jun 2012
Writeup from MB 100:

Northwest Africa 4165 (NWA 4165)

(Northwest Africa)

Purchased: 2005

Classification: Ureilite

History: A stone was purchased in Erfoud, Morocco, in 2002 for the DuPont Collection.

Physical characteristics: A single dark brown stone (432 g) with little fusion crust.

Petrography: (T. Bunch and J. Wittke, NAU): Heavily shocked, large areas of recrystallized olivine and pigeonite. Cathodoluminescence imagery shows high diamond density in thermally metamorphosed graphite (mostly amorphous).

Geochemistry: Olivine (Fa19.6, Fe/Mn=41, Cr2O3=0.64 wt%), pigeonite (Fs17.3Wo9, Fe/Mn=28, Cr2O3=1.35 wt%). Ni content in recrystallized metal inclusions in olivine is 0.64 to 3.15 wt%.

Classification: Ureilite

Specimens: The main mass, 21 g, and one thin section are in the DuPont Collection (FMNH).

Data from:
  Table 1
  Line 1168:
Place of purchase:Erfoud
Date:P 2005
Mass (g):432
Shock stage:high
Weathering grade:low
Fayalite (mol%):19.6
Ferrosilite (mol%):17.3
Wollastonite (mol%):9
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):21
Type spec location:FMNH
Main mass:FMNH
Comments:Submitted by T. Bunch
   and collections
FMNH: Department of Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 16 Nov 2011)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
DuPont: James M. DuPont Meteorite Collection, Deposited at FMNH in 2008., United States (private address; updated 1 Jun 2012)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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