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Northwest Africa 4816
Basic information Name: Northwest Africa 4816
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4816
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 63 g
Meteoritical Bulletin:  MB 94  (2008)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 91 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 17 Apr 2008
Writeup from MB 94:

Northwest Africa 4816

Northwest Africa

Find: 2006

Achondrite (acapulcoite)

History and physical characteristics: A 63 g stone was purchased in Erfoud, Morocco, in 2006 by Stefan Ralew. The partial stone has moderate surface weathering of broken areas. Small metal spherules and droplets protrude through a thin, residual fusion crust.

Petrography: (T. Bunch and J. Wittke, NAU) Highly enriched in kamacite metal, mineral modes (in vol%) are orthopyroxene, 33; olivine, 25; kamacite, 24; diopside, 15, plagioclase and felsic glass, 3 and FeS + chromite, 1.0. Silicates are fine-grained (mean = 0.60 mm) and show euhedral to subhedral grain outlines. Orthopyroxene contains micrometer-sized glass blebs. Rare, round to ovoid granular clusters may represent relict chondrules. Shock level is S2 and the weathering grade is W1.

Mineral compositions: Olivine, Fa5.6; FeO/MnO = 12. Orthopyroxene is Fs6.2Wo2.1, FeO/MnO = 9 and diopside is Fs2.8Wo45.5, FeO/MnO = 7. Plagioclase is An66, chromite cr# = 69 and kamacite contains 6.1 wt% Ni. Felsic glass is (in wt%): SiO2, 51.2; Al2O3, 20.3; CaO, 10.8; Na2O, 2.6; K2O, 0.8; MgO, 12.0 and FeO. 3.1.

Classification: Achondrite (acapulcoite).

Type specimen: A 12.4 g sample is on deposit at NAU. S. Ralew holds the main mass.

Data from:
  Table 2
  Line 63:
Mass (g):63
Shock stage:moderate
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):12.1
Type spec location:NAU
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Ralew: Stefan Ralew, Kunibertstra├če 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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