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Northwest Africa 10310
Basic information Name: Northwest Africa 10310
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10310
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 136.8 g
Meteoritical Bulletin:  MB 104  (2015)  L6
Recommended:  L6    [explanation]

This is 1 of 12995 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 10310 (NWA 10310)

(Northwest Africa)

Purchased: April 2013

Classification: Ordinary chondrite (L6)

History: Purchased on-line as an NWA meteorite originally from a Moroccan dealer by John Shea in April 2013 and a portion subsequently donated to Cascadia.

Physical characteristics: Already cut individual with partial fusion crust. Sawed faces show chondritic texture with rust haloes around the metal.

Petrography: (M. Ream and A. Ruzicka, Cascadia) Large chondrules in this sample are somewhat readily recognized in thin section with transmitted light, but boundaries are indistinct and matrix is mostly transparent, and feldspar grain size is up to 100 μm across, consistent with petrographic type 6. The mean diameter of the recognizable chondrules (N = 20) is 0.9±0.4 mm. Contains about 4% metal + 6% troilite (+ minor weathering products). Olivine grains are mosaicized and most grains display 2 sets of planar fractures indicative of shock stage S4. Chromite-feldspar pods are also present. One unusual ~3-mm- diameter object is concentrically zoned with a fine-grained (10 – 30 μm) core of silica and metal, a mantle of low- and high-Ca pyroxene, and a ragged, 50 – 100 μm thick rim of feldspar ± chromite with 5 – 10 μm grains of troilite dispersed evenly throughout the object.

Geochemistry: Olivine, Fa 25.8±0.4(Fa25.4-26.8, N = 12); low-Ca pyroxene, Fs21.6±0.4Wo1.8±0.3 (Fs21.1-22.5, N = 9); high-Ca pyroxene, Fs8.6±2.2Wo 45.2±2.5 (Wo43.4-46.9, N = 2); feldspar, Ab84.8±4.2Or5.9±1.4 (Ab81.8-91.1, N = 4).

Classification: Data are most consistent with an L6 chondrite.

Specimens: Cascadia holds 40.4 g, a polished thin section, and potted butt. John Shea holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P April 2013
Mass (g):136.8
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):25.8±0.4
Ferrosilite (mol%):21.6±0.4
Wollastonite (mol%):1.8±0.3
Classifier:M. Ream and A. Ruzicka, Cascadia
Type spec mass (g):42
Type spec location:Cascadia
Main mass:John A. Shea, 201 East Valley Rd, Wallingford, PA, 19086
Comments:Lab number CML0746; 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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
John A. Shea   

     This is 1 of 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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