Meteoritical Bulletin: Entry for Northwest Africa 6680

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Northwest Africa 6680

Basic information

Name: Northwest Africa 6680
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6680
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 195 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	EL6
Recommended:			EL6 [explanation]

This is 1 of 133 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 16 Dec 2011

Writeup

help

Writeup from MB 100:

Northwest Africa 6680 (NWA 6680)

(Northwest Africa)

Purchased: 2010

Classification: Enstatite chondrite (EL6)

History: Purchased by Giorgio Tomelleri at the Erfoud market, Morocco.

Physical characteristics: A single dark brown piece weighing 195 g, with no fusion crust

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP): The texture is characterized by rare indistinct chondrules set in a fine-grained matrix dominated by pyroxene. Enstatite accounts for about 90% of the total volume. Indistinct chondrules are mainly RP, with minor GP, and range from 1 to 2 mm (mean 1 mm). Plagioclase is rare. Opaques include iron oxides, due to kamacite and troilite weathering. 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. Several multiple subparallel and anastomozing thin veinlets (~200 μm) filled with iron oxides/hydroxides traverse the section.

Geochemistry: Enstatite (Fs_0.3-1.2En_97.3-98.3Wo_1.4-1.5), plagioclase (An_15.0Or_3.6).

Classification: Enstatite chondrite (EL6); S2; W5. This specimen is probably paired with NWA 4415, NWA 4416 and NWA 6542.

Specimens: A total of 20.5 g of sample, one polished thin section and a block are on deposit at MSP (MSP 5146).

Data from:
  MB100
  Table 1
  Line 1476:

Place of purchase:	Erfoud
Date:	P 2010
Mass (g):	195
Pieces:	1
Class:	EL6
Shock stage:	S2
Weathering grade:	W5
Ferrosilite (mol%):	0.6 (0.3-1.2)
Wollastonite (mol%):	1.4
Classifier:	V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP
Type spec mass (g):	20.5
Type spec location:	MSP
Main mass:	Unknown
Comments:	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 22 Oct 2022)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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