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Northwest Africa 10313
Basic information Name: Northwest Africa 10313
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10313
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 154.2 g
Meteoritical Bulletin:  MB 104  (2015)  L6
Recommended:  L6    [explanation]

This is 1 of 12920 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Sep 2015
Writeup from MB 104:

Northwest Africa 10313 (NWA 10313)

(Northwest Africa)

Purchased: February 2015

Classification: Ordinary chondrite (L6)

History: Purchased from Horst Burkhard in Tuscon in Feb 2015 as an unclassified NWA meteorite, and a portion subsequently donated to Cascadia.

Physical characteristics: Partly fusion crusted individual, broken surfaces mostly have dark patina, one cut face shows chondritic texture with metal that locally forms vein-like segments. There are rust haloes surrounding the metal grains. Fusion crust is very thin and reveals underlying chondritic texture.

Petrography: (M. Ream and A. Ruzicka, Cascadia) Chondrules are poorly defined and large (diameter 1.5±0.6 mm, N = 18) and are set in mostly transparent, coarse matrix, with secondary feldspar grain sizes exceeding 50 μm. Moderate mosaicism and planar fracturing in olivine indicates shock grade S4. Contains ~4-5% metal and ~3% troilite.

Geochemistry: Olivine, Fa25.5±0.3 (Fa24.9–26.2, N = 22); low-Ca pyroxene, Fs21.7±0.7Wo1.6±0.3 (Fs20.9-24.0Wo1.1–2.1, N = 27).

Classification: L6 chondrite based on mineral composition, metal content, and texture, although chondrule size relatively large.

Specimens: Cascadia holds a 39.5 g slab, a 3.6 g slice, a 0.5 g slice, a polished thin section, and a potted butt. Art Johnstone holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Tuscon, AZ, U.S.A.
Date:P February 2015
Mass (g):154.24
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):25.5±0.3
Ferrosilite (mol%):21.7±0.7
Wollastonite (mol%):1.6±0.3
Classifier:M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):43.6
Type spec location:Cascadia
Main mass:Art Johnstone
Comments:Lab number CML0846; 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)
Horst: Burkard Horst, Germany (private address)
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 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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