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Northwest Africa 14397
Basic information Name: Northwest Africa 14397
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14397
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 752 g
Classification
  history:
Recommended:  H5    [explanation]

This is 1 of 10945 approved meteorites (plus 20 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 31 Oct 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14397 (NWA 14397)

Morocco

Purchased: Aug 2019

Classification: Ordinary chondrite (H5)

History: Purchased by Sean Tutorow from a dealer in August 2019 in Morocco.

Physical characteristics: The type specimen piece has a rough surface and lacks fusion crust. The stone has a dark brown matrix color with lighter colored chondrules (~50% vol.), completely oxidized metal and small cavities and cracks.

Petrography: (R. Zhao, UBayr) Main mineral phases are (1) Olivine, colorless, granular shape, subhedral, 0.02-0.3 mm, with irregular fractures; (2) Low-Ca pyroxene, 0.3-0.5 mm, highly weathered (3) high-Ca pyroxene, as minor phase mainly in chondrules; (4) Feldspar. (5) Weathered iron sulfides as iron sulfates, distributed in matrix and fractures of chondrules. Several anomalously large chondrules were observed with defined boundaries (average size measured and n): (1) Porphyritic chondrules with Olivine (PO), 1.4±0.6 mm, n= 7, (2) Porphyritic chondrules with Olivine and Pyroxene (POP), 1.0 mm, n= 1; (3) Porphyritic chondrules with Pyroxene (PP), 1.0±0.4 mm, n= 10, with weathered silicates; (4) Radial pyroxenes chondrules (RP), 2.0±0.4 mm, n= 8; (5) Barred pyroxene chondrule (BP) with clinopyroxene, 0.8 mm. 3. Weathering grade: W5 based on 80% oxidation of metal and sulfides, and 30% of weathered silicate minerals. 4. Shock stage: S2 based on undulatory extinction and irregular fractures of olivine in chondrules.

Geochemistry: Olivine (Fa18.0±0.2; Fe/Mn = 37.0±3.8; n=18), low-Ca pyroxene (Fs15.9±0.3Wo1.0±0.3, Fe/Mn = 21.3±2.9; n=18), high-Ca pyroxene(Fs6.0±0.2Wo45.0±0.5, Fe/Mn = 17.4±0.7; n=3), and feldspar An11.6±2.5Or7.0±3.0 (n=14).

Classification: H5

Specimens: 76.7 g including a thin section and polished mount at UBayr. S. Tutorow holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Aug 2019
Mass (g):752.3
Pieces:1
Class:H5
Shock stage:S2
Weathering grade:W5
Fayalite (mol%):18.0±0.2
Ferrosilite (mol%):15.9±0.3, 6.0±0.2
Wollastonite (mol%):1.0±0.3, 45.0±0.5
Classifier:R. Zhao, UBayr
Type spec mass (g):76.7
Type spec location:UBayr
Main mass:S. Tutorow
Comments:G617; submitted by A. Bouvier
Institutions
   and collections
UBayr: Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany (institutional address; updated 5 Feb 2020)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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