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Northwest Africa 13599
Basic information Name: Northwest Africa 13599
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13599
Observed fall: No
Year found: 2019
Country: Morocco
Mass:help 40 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 409 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 18 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13599 (NWA 13599)

Morocco

Find: 2018

Classification: HED achondrite (Howardite)

History: A single stone weighing 50 g was found in 2018 by an anonymous finder in Morocco and purchased in March 2019 at the Bologna Fair by Lucian Cojocaru

Physical characteristics: The main mass is partially covered by a black, shiny fusion crust with several cracks.

Petrography: (V.Moggi Cecchi, L.Fabrizi, G.Pratesi, UniFi): The thin section analyzed shows a polymict breccia with a basaltic lithology (of eucrite composition), and an orthopyroxene-rich lithology with minor olivine (orthopyroxene of diogenite composition), and mineral fragments set into a more fine-grained clastic matrix. Eucrite and diogenite lithologies are found in approximately equal abundances. A large (1 mm) clast consisting of a very fine intergrowth of olivine, silica and plagioclase mixed with larger high-Ca pyroxene is visible; large orthopyroxene and diopside crystals, ranging in width from 600 to 1000 µm are common, with minor olivine crystals and very large (600-1000 μm) clasts of elongated diopside-orthopyroxene crystals; scattered low-Ca pyroxene crystals, 400-800 µm in size, with fine (5-10 μm) pigeonite exsolution lamellae are visible. A large (200x800 µm) silica polymorph crystal is also present. Minor phases are FeNi metal and troilite, with rare ilmenite and chromite grains.

Geochemistry: EMP (V. Moggi Cecchi, L. Fabrizi, G. Pratesi, UniFi); Olivine in Ol/silica intergrowth (Fa75.9±1.6Fs24.1±1.4; n=5; Fe/Mn = 38.3±0.2); Olivine crystals (Fa58.4±1.2Fs41.6±1.3; n=8; Fe/Mn = 46.6±0.2); Low-Ca pyroxene crystals (Fs23.3±0.3En74.1±0.7Wo2.6±0.3; n=7; Fe/Mn = 29.5±0.2); Low-Ca lamellae in exsolved orthopyroxene (Fs55.2±1.4En40.8±1.2Wo4.0±0.3; n=5; Fe/Mn = 28.9±0.2); Diopside exsolution lamellae in orthopyroxene (Fs29.6±1.2En29.0±0.9Wo41.8±1.1; n=7; Fe/Mn = 27.2±0.3); Calcic plagioclase An86.0±0.5Or0.7±0.5, n=8.

Classification: Howardite with medium degree of shock and medium degree of weathering.

Specimens: Lucian Cojocaru owns the main mass, weighing 40 g; the type specimen, weighing 10 g, and one thin section are on deposit at MSN-FI (Inventory # I-3615)

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Morocco
Place of purchase:Bologna Mineral Fair
Date:2018
Mass (g):40.0
Pieces:1
Class:Howardite
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):58.4±1.2 (N=8)
Ferrosilite (mol%):23.3±1.0 (N=8); 55.2±1.4 (N=5)
Wollastonite (mol%):2.6±0.2;4.0±0.5
Classifier:V. Moggi Cecchi, L. Fabrizi, UniFi
Type spec mass (g):10.0
Type spec location:MSN-FI
Main mass:Lucian Cojocaru
Finder:Anonymous
Comments:Provisional name NWA 13599; Inventory # I-3615; submitted by Vanni Moggi Cecchi
Institutions
   and collections
MSN-FI: MUSEO DI STORIA NATURALE DELL'UNIVERSITA' DEGLI STUDI DI FIRENZE Via Giorgio La Pira, 4 – 50121 FIRENZE, Italy; Website (institutional address; updated 14 Jan 2015)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Vanni Moggi Cecchi               
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1741 approved meteorites from Morocco (plus 26 unapproved names) (plus 1 impact crater)

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