header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 12 Mar 2019
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 12344
Basic information Name: Northwest Africa 12344
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12344
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 456 g
Classification
  history:
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 339 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12344 (NWA 12344)

(Northwest Africa)

Purchased: 2018 Jan

Classification: HED achondrite (Eucrite, polymict)

Petrography: (K. Metzler, IfP) Polymict breccia consisting of eucritic lithic clasts with ophitic textures and mineral fragments (pyroxene, plagioclase, silica polymorph) set in a fine-grained matrix of related debris. The matrix is clastic, bound by intergranular shock-melt, and intermingled with vesicular melt pockets (up to 5 mm). The latter show quench tetxtures, consisting of parallel aligned pyroxene and plagioclase skeletal crystals. Both pyroxenes with and without exsolution lamellae occur. Iron-rich olivine was found as isolated fragments and in the shape of veins in lithic clasts. Accessories are silica polymorph, ilmenite, Cr-spinel, troilite, and Ni-poor metal.

Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene: Fs64.5±4.4Wo2.4±0.7 (Fs55.8-68.4Wo1.9-4.7); mean Fe/Mn (at.): 29.8; n=13. Ca-rich pyroxene: Fs30.8±1.0Wo42.5±0.6 (Fs28.4-32.2Wo41.6-43.4) n=12. Olivine: Fa75.0 (Fa74.6-75.7); mean Fe/Mn (at.): 44.1; n=3. Plagioclase An90.6±2.5Or0.3±0.3 (An86.9-94.0Or0.0-0.8); n=8.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Talsint, Morocco
Date:P 2018 Jan
Mass (g):456
Pieces:many
Class:Eucrite-pmict
Shock stage:strong
Weathering grade:moderate
Fayalite (mol%):75.0
Ferrosilite (mol%):64.5; 30.8
Wollastonite (mol%):2.4; 42.5
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP, Münster
Main mass:Nourddine Azelmat, Morocco
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. 107, in preparation (2018)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6672 approved meteorites from (Northwest Africa) (plus 2024 unapproved names)

Direct link to this page