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Northwest Africa 12220
Basic information Name: Northwest Africa 12220
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12220
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 57 g
Classification
  history:
Recommended:  R3-4    [explanation]

This is 1 of 6 approved meteorites classified as R3-4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 7 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12220 (NWA 12220)

(Northwest Africa)

Purchased: 2007 June

Classification: Rumuruti chondrite (R3-4)

History: Purchased from a Moroccan dealer at the meteorite show in Ensisheim, France.

Petrography: (K. Metzler, IfP) Chondritic breccia, consisting of light chondritic clasts, embedded in a matrix of isolated chondrules and chondritic debris. Many chondrules and chondrule fragments are unequilibrated and stem from lithologies of type 3. Light clasts are metamorphosed and belong to the petrologic type 4.

Geochemistry: Mineral compositions and geochemistry: Clasts of petrologic type 4: mean olivine composition Fa39.3±0.6 (Fa37.6-40.0); n=12; mean pyroxene composition Fs13.1±2.3Wo43.2±2.3 (Fs9.8-16.6Wo39.8-46.2); n=14. Fragments of petrologic type 3: range of observed olivine compositions Fa2.5-20.8; n=16; range of observed low-Ca pyroxene compositions: Fs1.7-18.4Wo0.4-5.0; n=17. Mineral compositions and geochemistry: Clasts of petrologic type 4: mean olivine composition Fa39.3±0.6 (37.6-40.0); n=12; mean pyroxene composition Fs13.1±2.3Wo43.2±2.3 (Fs9.8-16.6Wo39.8-46.2); n=14. Fragments of petrologic type 3: mean olivine composition Fa13.5±5.5 (Fa2.5-20.8); n=16; mean pyroxene composition Fs7.1±6.8Wo2.2±1.7 (Fs1.7-18.4Wo0.4-5.0); n=17.

Classification: R chondrite based on mineral chemistry. Genomict breccia, consisting of chondrules and chondrule fragments from type 3 lithologies (unequilibrated olivine and pyroxene) and type 4 clasts (equilibrated olivine and unequilibrated pyroxene).

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2007 June
Mass (g):57
Pieces:1
Class:R3-4
Shock stage:S3
Weathering grade:moderate
Fayalite (mol%):39.3
Classifier:K. Metzler, IfP
Type spec mass (g):11.5
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. 108, in preparation (2019)
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)

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