header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 26 Oct 2021
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 13990
Basic information Name: Northwest Africa 13990
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13990
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 69 g
Classification
  history:
Recommended:  Howardite    [explanation]

This is 1 of 400 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 29 Jun 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13990 (NWA 13990)

(Northwest Africa)

Purchased: 2010 Dec

Classification: HED achondrite (Howardite)

History: Purchased from a Moroccan mineral dealer at the mineral show in Hamburg, Germany

Petrography: (K. Metzler, IfP) Achondritic clast-rich melt rock consisting of lithic clasts (up to several cm in diameter) and mineral fragments (pyroxene and plagioclase), which are embedded in a crystallized melt. The melt matrix consists of pyroxene and plagioclase crystals with an ophitic texture. Diogenitic pyroxenite clasts and eucritic clasts with gabbroic texture were found. Most clasts are moderately to strongly recrystallized. Small grains of Ni-bearing metal and olivine are dispersed in the melt matrix.

Geochemistry: Mineral compositions and geochemistry: Pyroxene in eucrite clast: Fs31±1.1Wo8.5±1.6 (Fs29.8-32.8Wo6.9-12.4); mean Fe/Mn (at.): 28.3; n=10. Plagioclase in eucrite clast: An83.0±5.3Or0.3±0.2 (An75.3-89.3Or0.0-0.7); n=11. Pyroxene in diogenite clast: Fs22.7±2.3Wo2.3±0.4 (Fs19.4-25.3Wo1.7-3.1); mean Fe/Mn (at.): 28.9; n=11. Olivine grains: Fa39.8±4.0 (Fa33.8-43.9); Fe/Mn (at.): 53.6; n=8.;

Classification: Howardite (clast-rich melt rock) with diogenitic (~60 vol%) and eucritic (~40 vol%) components.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Hamburg, Germany
Date:P 2010 Dec
Mass (g):69
Pieces:6
Class:Howardite
Shock stage:M-S2
Weathering grade:low
Fayalite (mol%):39.8±4.0
Ferrosilite (mol%):31±1.1; 22.7±2.3
Wollastonite (mol%):8.5±1.6; 2.3±0.4
Classifier:K. Metzler, IfP
Type spec mass (g):14
Type spec location:IfP
Main mass:anonymous
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

Direct link to this page