MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 19 Mar 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 15576
Basic information Name: Northwest Africa 15576
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15576
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 248 g
Recommended:  EL6    [explanation]

This is 1 of 129 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 29 Jan 2023
Writeup from MB 112:

Northwest Africa 15576 (NWA 15576)

(Northwest Africa)

Find: 2022

Classification: Enstatite chondrite (EL6)

History: Single stone purchased by Nicola Castellano at the Genova Mineral Fair in 2022 and weighing 248 g

Physical characteristics: Main mass without fusion crust. A cut surface displays several metal veins in a brown silicate equilibrated matrix.

Petrography: (V. Moggi Cecchi, G. Pratesi, L. Fabrizi, UniFi): An equilibrated texture consisting of a fine-grained, pyroxene-rich matrix, with minor plagioclase and no relic chondrules is visible in thin section. Kamacite and troilite, partially weathered to iron oxides, are the main opaque phases. Troilite occasionally displays blades of daubréelite and rare alabandite. The presence of alabandite, An content of plagioclase and Si content of kamacite point to a classification as EL chondrite;

Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, L. Fabrizi, UniFi): Orthopyroxene (Fs0.6±0.1En98.0±0.3Wo1.4±0.1), plagioclase (An15.3Or4.1); Si in kamacite = 0.6 wt.%, Mn in daubréelite = 2.7 wt.%

Classification: Enstatite Chondrite (EL6); S2; W2;

Specimens: The main mass, weighing 248 g, is owned by Castellano; the type specimen, weighing 28.1 g , and one thin section are on deposit at MSN-FI (Inventory # I-3703).

Data from:
  Table 0
  Line 0:
Place of purchase:Genova Mineral Fair
Mass (g):248
Shock stage:S2
Weathering grade:W3
Ferrosilite (mol%):0.6±0.1 (N=10)
Wollastonite (mol%):1.4±0.1
Classifier:V. Moggi Cecchi, G. Pratesi, L. Fabrizi, UniFi
Type spec mass (g):28.1
Type spec location:MSN-FI
Main mass:Nicola Castellano
Comments:Inventory # I-3703; submitted by Vanni Moggi Cecchi
   and collections
MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022)
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. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

Direct link to this page