header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 2 Oct 2023
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 999
Basic information Name: Northwest Africa 999
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 999
Observed fall: No
Year found: 2000
Country: Morocco
Mass:help 330 g
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 589 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 3 Feb 2006
Writeuphelp
Writeup from MB 90:

Northwest Africa 999

Morocco

Find: 2000

Achondrite (eucrite)

History: A 330 g brecciated stone was purchased at the Tucson show by DGregory from an anonymous Moroccan dealer.

Petrology: (P. Warren, UCLA) An extremely fine-grained (0.01–0.1 mm) stone with thoroughly exsolved pyroxenes, some pyroxenes (<1 vol%) up to 0.6 mm in maximum dimension. Microphenocrysts are compositionally identical to the groundmass pyroxenes.

Geochemistry: Low-Ca pyroxene (En32.0Wo2.3); high-Ca pyroxene (En27.8Wo44.1). Bulk chemistry: (INAA, UCLA two chips) Al2O3 = 12.5 wt%, Na = 2.83 and 2.84 (both wt%); Sc = 32 and 33; Sm = 2.1 and 2.2 (both µg/g); Fe/Mn = 36, 37.

Classification: Achondrite (eucrite); low to moderate shock.

Specimens: A 20 g type specimen is on deposit at UCLA. Gregory holds the main mass.

Data from:
  MB90
  Table 2
  Line 2:
Place of purchase:Morocco
Date:2000
Mass (g):330
Pieces:1
Class:Euc
Shock stage:low-medium
Ferrosilite (mol%):68
Type spec mass (g):20
Institutions
   and collections		 UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2003 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Direct link to this page