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Northwest Africa 5784
Basic information Name: Northwest Africa 5784
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5784
Observed fall: No
Year found: 2008
Country: Morocco
Mass:help 2.6 kg
Meteoritical Bulletin:  MB 98  (2010)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 522 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 14 May 2010
Writeup from MB online:

Northwest Africa 5784 (NWA 5784)


Purchased: 2008

Classification: HED achondrite (Diogenite)

History: A single 2.6 kg, dark brown stone was purchased in February 2008 from a Moroccan dealer at the Tucson Gem and Mineral Show by Blaine Reed.

Petrography: A cataclastic dunite that contains (in vol. %) olivine, 91; plagioclase, 5; low-Ca pyroxene, 2; chromite and Fe-metal, 2. Severe crushing is prevalent throughout the rock; many of the olivine and plagioclase fragments show mottled extinction. Finest grain size domains are recrystallized. Slight staining around tiny metal grains was observed.

Geochemistry: Olivine (Fa31.3; FeO/MnO = 34); plagioclase (An94.5); chromite (cr# = 70); metal (Ni = 0.35 wt %). Oxygen isotopes (D. Rumble, CIW): Replicate analyses of acid-washed whole rock samples by laser fluorination gave, respectively, δ18O = 3.56, 3.10; δ17O = 1.67, 1.39; Δ17O = -0.205, -0.243 per mil.

Classification: Achondrite (diogenite). Mineral compositions and oxygen isotopic composition suggest affinity with diogenites. The meteorite is olivine-rich compared to diogenites and may be considered a dunitic (or olivine-rich) diogenite.

Specimens: A total of 20.6 g is on deposit in the PSF collection at FMNH. Reed holds the main mass.

Data from:
  Table 1
  Line 35:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2008
Mass (g):2600
Fayalite (mol%):31.3
Classifier:T. Bunch, J. Wittke, NAU
Type spec mass (g):20.6
Type spec location:FMNH
Main mass:Reed
Comments:ol-rich diogenite; submitted by T. Bunch
Plots: O isotopes:  
   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)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 98, MAPS 45, 1530-1551 (2010)
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     This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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