Meteoritical Bulletin: Entry for Northwest Africa 4399

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Northwest Africa 4399

Basic information

Name: Northwest Africa 4399
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4399
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 210 g

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	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 24 Jul 2007

Writeup

help

Writeup from MB 92:

Northwest Africa 4399

Northwest Africa

Find: 2005

Achondrite (acapulcoite)

History: The meteorite was recovered in northwest Africa by an anonymous finder and purchased by Stefan Ralew in Midelt, Morocco in 2005.

Physical characteristics: Many small fragments totaling 210 g were recovered.

Petrography: (A. Greshake, MNB) The meteorite consists dominantly of low-Ca pyroxene, olivine, augite, troilite, metallic Fe-Ni and plagioclase; minor phases include chromite and phosphates. It displays a completely recrystallized texture with abundant 120° triple junctions.

Mineral compositions: Olivine (Fa_7.3; range Fa_6.5-7.8), low-Ca pyroxene (Fs_8.7-9.2Wo_2.2-3.2), augite, (Fs_3.7-4.4Wo_41.3-44.3; up to Cr₂O₃= 1.7 wt%). Oxygen Isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ¹⁷O = 1.61, δ¹⁸O = 4.87, Δ¹⁷O = -0.92 (all ‰).

Classification: Achondrite (acapulcoite); minimal shock, extensive weathering. The sample may be paired with NWA 2627.

Type specimens: A total of 20.3 g of sample plus one polished thin section are on deposit at MNB. Ralew holds the main mass.

Data from:
  MB92
  Table 2
  Line 69:

Place of purchase:	Tagounite, Morocco
Date:	2005
Mass (g):	210
Pieces:	many
Class:	Acp
Type spec mass (g):	20.3

Plots:

O isotopes:

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Don Edwards
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Dirk Hohmann
Gregor H.

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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