Meteoritical Bulletin: Entry for Northwest Africa 11648

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Northwest Africa 11648

Basic information

Name: Northwest Africa 11648
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11648
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass: 30 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	L6
Recommended:			L6 [explanation]

This is 1 of 12583 approved meteorites (plus 8 unapproved names) classified as L6. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 29 Jan 2018

Writeup

Writeup from MB 107:

Northwest Africa 11648 (NWA 11648)

(Northwest Africa)

Purchased: 2002 Feb

Classification: Ordinary chondrite (L6)

History: A single stone was purchased by Edwin Thompson at the Tucson Gem Show and donated to Cascadia.

Petrography: About a dozen readily identifiable chondrules are visible in thin section, but their edges grade into surrounding granular regions. Approximately 2% metal present. Minimal weathering. Shock stage (conventional) estimated from olivine deformation; plagioclase deformed.

Geochemistry: (A. Ruzicka and K. Farley, Cascadia) Olivine (Fa_24.9±0.2, N=13), low-Ca pyroxene (Wo_1.5±0.3Fs_21.1±0.2En_77.4±0.2, N=12), plagioclase (Ab_85.1±0.6Or_3.2±0.4An_11.4±0.8, N=13).

Classification: L6 chondrite based on texture and mineral chemistry.

Specimens: Cascadia holds the main mass and type specimen, consisting of 28.7 g in two pieces plus one thin section.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2002 Feb
Mass (g):	30
Pieces:	1
Class:	L6
Shock stage:	S5
Weathering grade:	W1
Fayalite (mol%):	24.8±0.2
Ferrosilite (mol%):	21.1±0.2
Wollastonite (mol%):	1.5±0.3
Classifier:	A. Ruzicka, K. Farley, M. Hutson, Cascadia
Type spec mass (g):	28.7
Type spec location:	Cascadia
Main mass:	Cascadia
Comments:	Lab number CML0015; submitted by Alex Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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