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Northwest Africa 10456
Basic information Name: Northwest Africa 10456
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10456
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 573 g
Meteoritical Bulletin:  MB 104  (2015)  L4
Recommended:  L4    [explanation]

This is 1 of 2102 approved meteorites (plus 5 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Dec 2015
Writeup from MB 104:

Northwest Africa 10456 (NWA 10456)

(Northwest Africa)

Purchased: Feb 2002

Classification: Ordinary chondrite (L4)

History: Purchased from a Moroccan trader at the Tucson show in February 2002; 22.2 g slice donated to Cascadia on July 2, 2012.

Physical characteristics: Fusion crust covers ~90% of the surface; all exterior surfaces show brown-red weathering patina; cut faces show chondritic texture.

Petrography: Composed of well-defined chondrules (diameter 0.73±0.41 mm, N=77), some with fine-grained rims, and ~20% intervening opaque to translucent fine-grained matrix. Contains ~2-3% metal + troilite each, with ~40-50% metal and ~40% troilite weathered. Shock stage S4 (N=25 olivine grains). One ~2 × 1 mm inclusion, an apparent clast, contains chondrule and silicate fragments and a spinel-rich micro-CAI (~60 μm across) embedded in troilite.

Geochemistry: (M. Ream and A. Ruzicka, Cascadia) Olivine (Fa24.2±0.4, N=30), low-Ca pyroxene (Fs15.2±5.7Wo1.4±1.8En83.4±6.0, N=19).

Classification: L4 chondrite based on texture and mineral chemistry.

Specimens: Cascadia holds a 19.6 g slice, a polished thin section, and a mounted butt. Bob Falls holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb 2002
Mass (g):573
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):24.2±0.4
Ferrosilite (mol%):15.2±5.7
Wollastonite (mol%):1.4±1.8
Classifier:M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):22.2
Type spec location:Cascadia
Main mass:Bob Falls
Comments:Lab number CML0682; submitted by A. Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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