Meteoritical Bulletin: Entry for Northwest Africa 1835

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Northwest Africa 1835

Basic information

Name: Northwest Africa 1835
This is an OFFICIAL meteorite name.
Abbreviation: NWA 1835
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass: 28.8 g

Classification
history:

Meteoritical Bulletin:	MB 89	(2005)	Eucrite
MetBase:	v. 7.1	(2006)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Writeup

Writeup from MB online:

Northwest Africa 1835

Morocco

Found 2002

Achondrite (polymict eucrite)

A 28.8 g stone was purchased in Rissani, Morocco in 2003. Classification and mineralogy (T. Bunch and J. Wittke, NAU): polymict cumulate eucrite that contains a variety of shocked clasts (shock level, S3 – S5). Low-Ca pyroxenes range from Fs42Wo3.4 to Fs52.4Wo12.2; plagioclase from An92.1-94.4; minor ilmenite, chromite, sulfides, and silica. Several cumulate pigeonites contain melt inclusions (0.024 to 0.065 mm diameter) of micron to submicron pyroxenes, plagioclase, and glass. Defocussed microbeam analyses indicate bulk compositions similar to those suggested by Treiman (1997) to represent eucrite parent magmas. Very fresh crust and interior. Specimens: 5.7 g, NAU; main mass, Oakes.

Data from:
  MB89
  Table 7
  Line 24:

Place of purchase:	Morocco
Date:	2002
Mass (g):	28.8
Pieces:	1
Class:	Euc
Shock stage:	S4
Weathering grade:	W1
Ferrosilite (mol%):	42-52.4
Type spec mass (g):	5.7
Comments:	Plag An92.1-94.4; Undefined note. NAU is Northern Arizona University, Flagstaff, AZ 86011, USA

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)

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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
history:

This lists important revisions made to data for this record.

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