MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 3 Jun 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 7766
Basic information Name: Northwest Africa 7766
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7766
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 71.9 g
Meteoritical Bulletin:  MB 102  (2013)  EL6
Recommended:  EL6    [explanation]

This is 1 of 130 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 27 Apr 2013
Writeup from MB 102:

Northwest Africa 7766 (NWA 7766)

(Northwest Africa)

Purchased: 2011

Classification: Enstatite chondrite (EL6)

History: Purchased by Nicola Castellano at the Torino Mineral Show, Italy.

Physical characteristics: A single piece weighing 71.9 g with no fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP): The thin section displays an equilibrated texture with traces of chondrules in a matrix consisting of pyroxene and minor plagioclase. Sub-parallel iron oxides/hydroxides veinlets 160 μm-wide are present. Indistinct chondrules are mainly RP. Opaque phases dominated by kamacite and troilite, markedly weathered to iron oxides. Accessory phases are alabandite and daubreelite as blades in troilite. The presence of alabandite and Si content of kamacite point to a classification as EL chondrite

Geochemistry: Orthopyroxene, Fs0.6En97.9Wo1.4; plagioclase, An12.9Or3.8; Si in kamacite = 0.7 wt.%; Ti in troilite = 5.9 wt.%

Classification: Enstatite chondrite (EL6); S3; W4

Specimens: A total of 14.50 g and one thin section are on deposit at MSP (MSP 5234). Castellano holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Torino
Date:P 2011
Mass (g):71.9
Shock stage:S3
Weathering grade:W4
Ferrosilite (mol%):0.64
Wollastonite (mol%):1.40
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSP
Type spec mass (g):14.50
Type spec location:MSP
Main mass:Castellano
Comments:Inv. # MSP 5234; submitted by Vanni Moggi Cecchi
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

Direct link to this page