header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 14 Oct 2020
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:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Northwest Africa 4831
Basic information Name: Northwest Africa 4831
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4831
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 154 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 238 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 17 Apr 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 4831

Northwest Africa

Find: 2006

Achondrite (eucrite)

History and physical characteristics: A 154 g, partial stone with moderately fresh fusion crust, was purchased at the Denver Gem and Mineral Show in September 2006.

Petrography: (J. Wittke and T. Bunch, NAU) A monomict cumulate eucrite with breccia-within-breccia texture. Clasts tend to be subrounded and contain orthopyroxenes that are commonly devoid of exsolved Ca-pyroxenes. Plagioclase contains μm-sized oriented pyroxene inclusions. Weathering grade is low.

Mineral compositions: Orthopyroxene, Fs46.7–52Wo2.2–3.1 (FeO/MnO = 32); augite, Fs36.4Wo44.7; plagioclase An88–91.1.

Classification: Achondrite (eucrite, monomict cumulate).

Type specimen: A total of 21.4 g is on deposit at NAU. The main mass holder is anonymous.

Data from:
  MB94
  Table 2
  Line 71:
State/Prov/County:Erfoud
Date:2006
Mass (g):154
Pieces:1
Class:Eucrite
Shock stage:moderate
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):22
Type spec location:NAU
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

Direct link to this page