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Northwest Africa 15302
Basic information Name: Northwest Africa 15302
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15302
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 36.4 g
Classification
  history:
Recommended:  CK5    [explanation]

This is 1 of 209 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 22 Oct 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15302 (NWA 15302)

(Northwest Africa)

Purchased: 17 Mar 2018

Classification: Carbonaceous chondrite (CK5)

History: 9.5 g in 4 pieces was sent to Cascadia by John Shea, who purchased it online via Facebook Messenger on March 17, 2018, from Moroccan merchant Boulaouane Taleb Ahmed who stated it was found near Dakhla, by someone who lived in that city.

Petrography: (M. Hutson, A. Ruzicka, Cascadia): Individual chondrules, chondrule fragments, single grains, and plucked CAIs are readily discernable against a fine-grained darker background. Abundant phases identified in BSE imaging and element mapping include olivine, both low- and high-calcium pyroxene, plagioclase feldspar, pentlandite, and magnetite. Thin inclusions of an iron-titanium oxide are visible in larger magnetite grains. Elsewhere, magnetite sometimes forms thin rings around small olivine grains. Both merrillite and chlor-apatite were observed. Plagioclase has scalloped edges that conform to the shapes of surrounding grains, and contains individual olivine and pyroxene grains and other inclusions. Some low-Ca and high-Ca pyroxene grains also contain inclusions of olivine and scalloped edges. Both feldspar and high-Ca pyroxene sometimes form ribbons or stringers up to 0.5 mm (feldspar) or 1.5 mm (high-Ca pyroxene) in length. Numerous patches are present of symplectite consisting of low-calcium pyroxene, pentlandite, and magnetite, with rare olivine.

Geochemistry: Olivine: Fa33.6±0.3, N=19; low-Ca pyroxene: Fs27.5±0.2Wo0.9±0.5, N=11; high-Ca pyroxene: Fs11.4±1.8Wo46.7±1.8, N=12. Plagioclase feldspar compositions are heterogeneous; 15 analyses gave the following ranges: Ab 18.0-62.9, Or 0.8-9.2, An 30.0-81.2. Magnetite has Cr2O3 5.0±0.5 wt% (N=11)

Classification: Carbonaceous chondrite (CK5) based on mineral chemistry and texture. Textures and variable chemistry suggest that plagioclase feldspar melted, flowed, and re-solidified.

Specimens: Cascadia holds 8.4 g in three pieces, as well as a polished thin section and material in an epoxy butt; JShea holds the main mass.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:online
Date:P 17 Mar 2018
Mass (g):36.4
Pieces:1
Class:CK5
Shock stage:S4
Weathering grade:low
Fayalite (mol%):33.6±0.3 (N=19)
Ferrosilite (mol%):27.5±0.2 (N=11)
Wollastonite (mol%):0.9±0.5 (N=11)
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):9.5
Type spec location:Cascadia
Main mass:JShea (John A. Shea, Wallingford PA, https://bigjohnmeteorites.com/)
Comments:Lab number CML 1342; submitted by Melinda Hutson
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Melinda Hutson   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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