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Northwest Africa 7620
Basic information Name: Northwest Africa 7620
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7620
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 147 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  EL6
Recommended:  EL6    [explanation]

This is 1 of 120 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 1 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7620 (NWA 7620)

(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 147 g with no fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP): The thin section displays rare indistinct chondrules set in a fine-grained matrix, dominated by pyroxene, with minor plagioclase. Several sub-parallel 180 μm-wide veinlets filled with iron oxides/hydroxides also present. Chondrules range from 0.4 to 0.8 mm in diameter and are mainly RP type, with minor GP. Opaque phases are mainly kamacite and troilite, almost completely weathered to iron oxides. Accessory phases are alabandite and daubreelite as blades in troilite. The presence of alabandite, An content of plagioclase and Si content of kamacite point to a classification as EL chondrite.

Geochemistry: Orthopyroxene, Fs1.0En97.7Wo1.3; plagioclase, An13.9Or4.2; Si in kamacite = 0.8 wt.%; Ti in troilite = 6.1 wt.%.

Classification: Enstatite chondrite (EL6); S2; W3

Specimens: 20.97 g and one thin section are on deposit at MSP (MSP 5218). Castellano holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Torino
Date:P 2011
Mass (g):147
Pieces:1
Class:EL6
Shock stage:S2
Weathering grade:W3
Ferrosilite (mol%):1.00
Wollastonite (mol%):1.30
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSP
Type spec mass (g):20.97
Type spec location:MSP
Main mass:Castellano
Comments:Inv. # MSP 5218; submitted by Vanni Moggi Cecchi
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7320 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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