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Northwest Africa 12252
Basic information Name: Northwest Africa 12252
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12252
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 752 g
Classification
  history:
Recommended:  H3    [explanation]

This is 1 of 584 approved meteorites (plus 1 unapproved name) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 12 Apr 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12252 (NWA 12252)

Morocco, Laayoun, (Northwest Africa)

Purchased: May 2017

Classification: Ordinary chondrite (H3)

History: Collected by nomads in Western Sahara and purchased by Nicola Castellano at the Genova Mineral Fair in May 2017 from a Moroccan dealer.

Physical characteristics: A single piece weighing 752 g with traces of fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi); The thin section displays a chondritic texture, with scattered GO, GOP, PO and POP chondrules, ranging in size from 400 to 800 μm, in a fine grained matrix. GOP chondrules are poikilitic, with olivine grains embedded in twinned clinopyroxene. POP chondrules display olivine grains and elongated pyroxene grains in a glassy mesostasis. Olivine is homogenesous both in chondrules and in the matrix. Orthopyroxene in chondrules is inhomogeneous, with a core-rim variability. Plagioclase is Na and K-rich. Opaque phases are consisting of Fe,Ni alloys and troilite as individual grains scattered in the matrix or rimming chondrules. An armored chondrule is visible.

Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi); Olivine (Fa17.4±6.2Fo82.7±5.9; Fe/Mn = 41.2, n=25 ); Orthopyroxene in chondrule rims and matrix (Fs18.3±0.5En79.9±0.5Wo1.8±0.1, Fe/Mn = 24.1, n=13); Low-Ca px in grain cores (Fs7.9±4.2En91.6±3.9Wo0.5±0.1, Fe/Mn = 15.1, n=7), High-Ca pyroxene (Fs2.1±2.0En52.4±5.3Wo45.5±4.5, n=7); plagioclase (An33.7Or33.4);

Classification: Ordinary Chondrite (H3); S2; W4. Estimated subtype 3.6 based on texture and spread in olivine composition.

Specimens: A total of 41 g specimen is on deposit at MSN-FI. Castellano holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Morocco, Laayoun
Place of purchase:Genova
Date:P May 2017
Mass (g):752
Pieces:2
Class:H3
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):17.4±6.2 (n=25)
Ferrosilite (mol%):15.2±4.5 (n=15)
Wollastonite (mol%):1.8±0.4
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, UniFi
Type spec mass (g):41
Type spec location:MSN-FI
Main mass:Castellano
Comments: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. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6709 approved meteorites from (Northwest Africa) (plus 2022 unapproved names)

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