header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 10 Jul 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 12712
Basic information Name: Northwest Africa 12712
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12712
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 171 g
Classification
  history:
Recommended:  CV3    [explanation]

This is 1 of 493 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 4 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12712 (NWA 12712)

(Northwest Africa)

Find: 2018

Classification: Carbonaceous chondrite (CV3)

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, CAIs, and AOAs are embedded in a fine-grained dark matrix (about 30 vol% matrix). The matrix is Allende-like, mainly consisting of tiny (<5-20 µm) elongated olivine grains. Many chondrules have apparent diameters between 0.5 and 1 mm, some up to 2.5 mm. CAIs with sizes up to 2 mm are present. Small amounts of sulfides and traces of metal have been found.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa7.3±4.6 (Fa0.5-20.8; n=25). The mean low-Ca pyroxene composition is Fs1.5±0.6Wo1.0±0.4 (Fs0.7-2.9Wo0.5-1.7; n=14). The composition of matrix olivine (not included in Fa statistics) is Fa49.3±1.4 (Fa46.8-50.1; n=5).

Classification: CV chondrite based on CAI and AOA occurrence, size of chondrules and CAIs, chondrule-matrix ratio, and mineral chemistry. Petrologic type 3 based on the chemical variation of olivine and pyroxene

Data from:
  MB108
  Table 0
  Line 0:
Date:2018
Mass (g):171
Pieces:3
Class:CV3
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):7.3±4.6
Ferrosilite (mol%):1.5±0.6
Wollastonite (mol%):1.0±0.4
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Stephan Decker, Meteorite Museum, Oberwesel, Germany
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. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

Direct link to this page