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Northwest Africa 13099
Basic information Name: Northwest Africa 13099
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13099
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 657 g
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 10308 approved meteorites (plus 45 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Jan 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13099 (NWA 13099)

Morocco

Purchased: 2014 Feb

Classification: Ordinary chondrite (H5)

History: Purchased from a Moroccan dealer in 2014.

Physical characteristics: Physical Characteristics: Fusion crust covers most of the specimen, with some weathered patches. Saw cut reveals weathered interior with abundant reflective patches of metal and sulfide.

Petrography (D. Cantillo, M. James, S. Morin, UAz): Microprobe examination shows chondrules 500-1000 μm in size. The boundaries of these chondrules are relatively well-defined, with some partial re-crystallization. The areas of the matrix that were metal were surrounded by rust, composing about 50% of the sample. Plagioclase grains <70 μm in size. Large troilite, chromite, and merrillite grains are also present.

Geochemistry: Mineral composition and geochemistry (D. Cantillo, M. James, S. Morin, UAz): Olivine Fa18.1±0.2, Fe/Mn 33.49±2.06, n=10. Low-Ca Pyroxene Fs15.4±0.6Wo0.5±0.3, Fe/Mn 22.15±1.95, n=10. Kamacite Fe 92.30±0.28%, Ni 6.36±0.30%, Co 0.463±0.04%, n=3.

Classification: Ordinary Chondrite (H5), weathering grade W2

Specimens: 32.1 g and epoxy mount deposit at UAz. Fredric Stephan holds the main mass.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2014 Feb
Mass (g):656.6
Pieces:1
Class:H5
Weathering grade:W2
Fayalite (mol%):18.1±0.2 (n=10)
Ferrosilite (mol%):15.4±0.6 (n=10)
Wollastonite (mol%):0.52±0.33 (n=10)
Classifier:D. Cantillo, M. James, S. Morin, UAz
Type spec mass (g):32.1
Type spec location:UAz
Main mass:Fredric Stephan
Comments:Working name SH15; submitted by T. Swindle
Institutions
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1680 approved meteorites from Morocco (plus 25 unapproved names) (plus 1 impact crater)

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