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Northwest Africa 1099
Basic information Name: Northwest Africa 1099
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1099
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 140 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  L4
Recommended:  L4    [explanation]

This is 1 of 1715 approved meteorites (plus 4 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 20 Oct 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 1099 (NWA 1099)

(Northwest Africa)

Purchased: 2003

Classification: Ordinary chondrite (L4)

Petrography: Metal and sulfide grains are elongated; some metal grains contain small irregular grains of troiite. Chondrules are well defined. A few low-Ca pyroxene grains exhibit polysynthetic twinning. No glassy mesostases occur. Olivine grains exhibit weak mosaic extinction.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2003
Mass (g):140
Pieces:1
Class:L4
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):24.0
Classifier:A. Rubin, UCLA
Type spec mass (g):25
Type spec location:UCLA
Main mass:Michael Cottingham
Comments:Submitted by Simone de Leuw
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Woreczko Jan & Wadi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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