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Northwest Africa 4235
Basic information Name: Northwest Africa 4235
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4235
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 59 g
Meteoritical Bulletin:  MB 91  (2007)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 216 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 1 Sep 2006
Writeup from MB 91:

Northwest Africa 4235

Northwest Africa

Find: 2004

Achondrite (mesosiderite)

History: Twelve small pieces were purchased at the Hamburg Mineral Fair, Germany, from a Moroccan dealer in 2004. An anonymous finder recovered the meteorites from the western part of the Sahara.

Physical characteristics: The small angular fragments, with a total weight of 59 g, are without fusion crust. Large orthopyroxene crystals (up to 5 mm) are visible in the stony portions.

Petrography: (J. Schlüter, Ham) The stony portion with orthopyroxene and clinopyroxene, rich in plagioclase, shows a cataclastic texture with large mineral fragments (300– 900 µm) in a coarse matrix (>10 µm). Apatite and chromite grains are also observed.

Mineral compositions: Orthopyroxene (Fs26.5Wo3.0; range: Fs25.4–27.4Wo2.1–4.9; n = 16), plagioclase (An91.3Or0.4; range: An89.7–94.4Or0.3–0.5; n = 12), kamacite (Ni = 5.98 wt%), taenite (Ni = 46.3 wt%), fluorapatite (MgO = 3.69 wt%).

Classification: Achondrite (mesosiderite); minimal shock and weathering.

Type specimen: A total of 11.8 g sample is on deposit at Hamb. Herkstroeter holds the main mass.

Data from:
  Table 2
  Line 236:
Mass (g):59
Shock stage:minimal
Weathering grade:minimal
Ferrosilite (mol%):25.4-27-4
Classifier:J. Schlüter, Ham
Type spec mass (g):11.8
Type spec location:Ham
Main mass:I. Herkstroeter, Hamburg
   and collections
Hamb: Mineralogisches Museum, Universität of Hamburg, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 22 Feb 2013)
Ham: Mineralogisches Museum, Universität of Hamburg, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 22 Feb 2013)
Herkstroeter: Ingo Herkstroeter, Hamburg, Germany (private address)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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