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Northwest Africa 6542
Basic information Name: Northwest Africa 6542
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6542
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 15.8 g
Meteoritical Bulletin:  MB 99  (2011)  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 31 Jan 2011
Writeup from MB 99:

Northwest Africa 6542 (NWA 6542)

(Northwest Africa)

Purchased: 2005

Classification: Enstatite chondrite (EL6)

History: A small fragment was purchased at the Bologna Avis Fair by Romano Serra.

Physical characteristics: A single dark brown piece of 15 g with no fusion crust and traces of staining.

Petrography: Vanni Moggi Cecchi, Giovanni Pratesi, Stefano Caporali (MSP): The overall texture is characterized by very rare indistinct chondrules set in a fine-grained matrix mainly composed of pyroxene. Several multiple subparallel and anastomozing thin veinlets, about 150 μm long, filled with iron oxides/hydroxides can be observed in the thin section in reflected light. Enstatite accounts for about 90% of the total volume. Relict chondrules are mainly RP type, with minor PP, and range from 0.3 to 0.7 mm in diameter. Opaque phases are mainly altered kamacite (with 0.7 wt.% Si) and troilite (with 5.6 wt. % Ti). Accessory phases are alabandite, schreibersite and daubréelite as blades in troilite. The presence of alabandite and Si content of kamacite point to a classification as EL chondrite.

Geochemistry: Enstatite (En97.8Wo1.5), plagioclase (An14.1Or4.2).

Classification: Enstatite chondrite (EL6); S1; W3. This specimen is probably paired with NWA 4415 and NWA 4416.

Specimens: A total of 3 g of sample, one polished thin section and a block are on deposit at MSP. OAM holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Bologna
Date:P 2005
Mass (g):15.8
Weathering grade:W4
Ferrosilite (mol%):2.1
Wollastonite (mol%):1.5
Classifier:Vanni Moggi Cecchi, MSP
Type spec mass (g):3.53
Type spec location:OAM
Main mass:OAM
Comments: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)
OAM: Museo del Cielo e della Terra Vicolo Baciadonne 1 40017 San Giovanni in Persiceto ( BO) Italy Osservatorio Astronomico e Museo "Giorgio Abetti", San Giovanni Persiceto, Bologna, Italy; Website (institutional address; updated 31 Oct 2012)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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