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Northwest Africa 2923
Basic information Name: Northwest Africa 2923
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2923
Observed fall: No
Year found: 2005
Country: Morocco
Mass:help 16 kg
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Diogenite-pm
Recommended:  Diogenite    [explanation]

This is 1 of 437 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 3 Feb 2006
Writeuphelp
Writeup from MB 90:

Northwest Africa 2923

Morocco

Find: July 2005

Achondrite (diogenite polymict breccia)

History: A 606 g complete stone fully crusted with moderately fresh fusion crust was purchased in Erfoud, Morocco, in July 2005.

Physical Characteristics: (T. Bunch and J. Wittke, NAU) A light buff-color interior matrix with clear, yellow, green, dark diogenite clasts.

Petrography: Modal analyses of a 27 cm2 surface area: diogenites (grain size <2.7 cm) = 83, olivine microbasalts = 6, shock melt clasts = 5, recrystallized cumulate basalts = 4, chromite, sulfide, ilmenite, metal = 2 (all vol%).

Geochemistry: Diogenite: Orthopyroxenes (Fs22–27.6Wo2.9; FeO/MnO = 28–31). Unique olivine microbasalt clasts: olivine (Fa33.6; FeO/MnO = 54; these are microphenocrysts <0.48 mm in diameter), orthopyroxene (<0.2 mm) (Fs27.7Wo2.8; FeO/MnO = 27) with <0.05 mm diameter grains of vermicular metal (Ni = 6.2 wt%), and FeS (Cr = 6.2 wt%); minor diopside (Fs10.0Wo45.7).

Classification: Achondrite (diogenite, polymict breccia); low to high (recrystallized melts) shock, minimal weathering.

Specimens: A 50 g type specimen is on deposit at NAU. MFarmer holds the main mass.

Data from:
  MB90
  Table 2
  Line 174:
Place of purchase:Unknown
Date:2005
Mass (g):16000
Pieces:many
Class:Dio
Type spec mass (g):50
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jean-Michel Masson   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1460 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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