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Northwest Africa 13199
Basic information Name: Northwest Africa 13199
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13199
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 1425 g
Recommended:  H4    [explanation]

This is 1 of 6407 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Feb 2020
Writeup from MB 109:

Northwest Africa 13199 (NWA 13199)

(Northwest Africa)

Purchased: 2019 Mar

Classification: Ordinary chondrite (H4)

History: Purchased from a dealer in Morocco in March 2019.

Physical characteristics: The meteorite has are a brown to redish colour with dark fractures and a thin fusion crust (< 1 mm). In hand specimen only very few chondrules are visible by eye.

Petrography: (Alena Krupp, Ubayr) Chondrule sizes vary between 0.2 mm up to 1 mm, with the smaller ones more abundant. The following types of chondrules were observed: PO, POP, PP, GOP, RP, BO and C, dominating types are GOP and POP, BO and C are rare. Only some have clear boundaries (e.g. BO), but most are less sharp, and some are indistinct in the matrix under polarized light. Irregular as well as planar fractures are clearly visible in olivines and pyroxenes. Metal and sulfides are present.

Geochemistry: Mineral compositions: Olivine Fa18.2±0.4 (N=14). Mean Cr2O3 = 0.0007, sigma Cr2O3 = 0.0011. FeO/MnO = 38±3. Low Ca pyroxenes Fs15.9±0.4Wo1.2±0.4 (N=15). High-Ca pyroxenes Fs6.3±0.7Wo43.9±2.2 (N=6).

Classification: Ordinary chondrite (H4), S3, W1.

Specimens: 49.8g at UBayr including a thin section and polished mount. S. Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2019 Mar
Mass (g):1424.9
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):18.2±0.4 (N=14)
Ferrosilite (mol%):6.3±0.7 (N=6); 15.9±0.4 (N=15)
Wollastonite (mol%):43.9±2.2 (N=6); 1.2±0.4 (N=15)
Classifier:A. Krupp, UBayr
Type spec mass (g):49.8
Type spec location:UBayr
Main mass:S. Tutorow
Comments:Field name G723.; submitted by A. Bouvier, UBayr
   and collections
UBayr: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany (institutional address; updated 5 Feb 2020)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   

     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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