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Northwest Africa 13597
Basic information Name: Northwest Africa 13597
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13597
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 411 g
Recommended:  H3    [explanation]

This is 1 of 669 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 16 Jan 2021
Writeup from MB 110:

Northwest Africa 13597 (NWA 13597)

(Northwest Africa)

Purchased: 2018 Oct

Classification: Ordinary chondrite (H3)

History: A single stone weighing 411 g was found by an anonymous finder in Western Sahara and purchased in October 2018 at the Turin Fair by Mario Di Martino.

Physical characteristics: The main mass is partially covered by a brown, partially stained fusion crust.

Petrography: (V.Moggi Cecchi, G.Pratesi, S.Caporali UniFi): In the thin section a chondritic texture can be observed, with small PO, POP and RP chondrules and chondrule fragments set in a fine grained matrix. Large olivine crystals in PO chondrules are zoned from core to rim. Olivine is markedly inhomogeneous and Mg-rich in chondrules, while Fe-rich in the matrix. Orthopyroxene in chondrules is inhomogeneous, too, with a core-rim variability. Opaque phases are represented by iron oxides, Fe-Ni alloys and troilite rimming chondrules or present as individual grains scattared in the matrix.

Geochemistry: EMP (V.Moggi Cecchi, G.Pratesi, S.Caporali UniFi); Olivine in both chondrules and matrix (Fa17.3±6.4Fo82.7±6.3; n=107; Fe/Mn = 43.9±30.2); low-Ca pyroxene in both chondrules and matrix (Fs12.1±5.2En87.2±5.4Wo0.7±0.3; n=65; Fe/Mn = 23.1±10.2);

Classification: Ordinary Chondrite (H3); S2; W2. Estimated subtype 3.7.

Specimens: The main mass, weighing 411 g, is own by Mario Di Martino; the type specimen, weighing 20.8 g, and one thin section are on deposit at MSN-FI (Inventory # I-3570).

Data from:
  Table 0
  Line 0:
Place of purchase:Turin Mineral Show
Date:P 2018 Oct
Mass (g):411
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):17.3±6.4 (N=107)
Ferrosilite (mol%):12.1±5.2 (N=65)
Wollastonite (mol%):0.8±0.3
Classifier:V. Moggi Cecchi, MSN-FI
Type spec mass (g):20.75
Type spec location:MSN-FI
Main mass:Di Martino
Comments:Field MDM18_19;Inv.I-3570; submitted by Vanni Moggi Cecchi
   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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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