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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 10864 approved meteorites (plus 19 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1847 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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