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Northwest Africa 10602
Basic information Name: Northwest Africa 10602
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10602
Observed fall: No
Year found: 2015
Country: Mauritania
Mass:help 1960 g
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 106 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 19 Apr 2016
Writeup from MB 105:

Northwest Africa 10602 (NWA 10602)


Purchased: April 2015

Classification: HED achondrite (Eucrite, melt breccia)

History: The sample was purchased by the main mass holder in Morocco, but is believed to originate in Mauritania.

Petrography: (R. Greenwood, OU) The meteorite is composed of angular, fine-grained, basaltic fragments up to 1 cm in diameter, enclosed in aphanitic, brown-stained, impact melt material. In a number of areas, oval vesicles up to 3 mm in long dimension are present in the impact melt material. The basaltic fragments have a generally uniform texture composed of acicular feldspar grains, generally less than 200 μm long, intergrown with dark, anhedral pyroxene grains. In places, a spherulitic texture is developed in the basaltic fragments, with elongate feldspars radiating outwards from a common point. Coarser-grained fragments with feldspar grains up to 0.5 mm long are also present. Feldspar in generally fresh, showing distinct undulose extinction in XPL. Pyroxene shows well-developed mosaicism.

Geochemistry: Mineral compositions and geochemistry: Pyroxene consists of a low-Ca pyroxene host, Fs60.3±1.1Wo3.7±1.3En36.0±0.8 (±1σ, n=5), with well-developed exsolution lamellae of augite, Fs27.3±1.1Wo43.0±1.0En29.7±0.5 (±1σ, n=4)). Plagioclase compositions are in the range An85.9-91.4 (n=5). Oxygen isotopes: (Laser-assisted fluorination) δ17O = 2.349‰; δ18O = 4.952‰; Δ17O = -0.246‰ (Δ17O calculated using method of Miller (2002), GCA 66, 1881-1889).

Classification: This meteorite is a brecciated eucrite with a significant impact melt component. It shows low to moderate weathering. May be paired with NWA 10603. However, the texture observed in polished section is fairly distinct from that of NWA 10603.

Specimens: A type specimen mass of 20.95 g is held at the OU. The main mass is held by Mohammed Hmani.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P April 2015
Mass (g):1960
Class:Eucrite-melt breccia
Classifier:R. Greenwood OU
Type spec mass (g):20.95
Type spec location:OU
Main mass:Mohammed Hmani
Comments:Submitted by Richard Greenwood
Plots: O isotopes:  
   and collections
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)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 224 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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