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Northwest Africa 4236
Basic information Name: Northwest Africa 4236
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4236
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 24 g
Meteoritical Bulletin:  MB 91  (2007)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 1 Sep 2006
Writeup from MB 91:

Northwest Africa 4236

Northwest Africa

Find: 2004

Achondrite (acapulcoite)

History: A small piece was 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: A 24 g angular fragment with some fusion crust.

Petrography: (J. Schlüter, Ham) Olivine, orthopyroxene, and kamacite are the main components. Rich in troilite and plagioclase with rare chromite grains. Large olivine and orthopyroxene grains (up to 900 µm) are set in a fine-grained matrix. Several relict chondrules (orthopyroxene and rare olivine) up to 2 mm in size are present. Tiny metal inclusions within the relict chondrules are also present. Most metal grains are 100–500 µm.

Mineral compositions and geochemistry: Olivine (Fa19.19), (range: n = 15, Fa18.56–19.62); orthopyroxene (Fs16.99), (range: n= 10, Fs16.70–17.14); plagioclase (Ab81.81Or5.6), (n = 2); kamacite with Ni = 6.40 wt%; taenite with Ni = 39.43 wt%; chromite = (Fe0.81Mg0.17Mn0.02) (Cr1.59Al0.28Fe0.07,Ti0.06)O4 (n = 4).

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

Type specimen: A total of 4.9 g is on deposit at Hamb. Herkstroeter holds the main mass.

Data from:
  Table 2
  Line 237:
Place of purchase:Hamburg, Germany
Mass (g):24
Shock stage:minimal
Weathering grade:minimal
Fayalite (mol%):19.2
Ferrosilite (mol%):17
Classifier:J. Schl├╝ter, Ham
Type spec mass (g):4.9
Type spec location:Ham
Main mass:I. Herkstroeter, Hamburg
   and collections
Hamb: Museum der Natur Hamburg - Mineralogie, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 18 Jan 2024)
Ham: Museum der Natur Hamburg - Mineralogie, Grindelallee 48, D-20146 Hamburg, Germany; Website (institutional address; updated 18 Jan 2024)
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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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