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Chwichiya 005
Basic information Name: Chwichiya 005
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: Western Sahara
Mass:help 249 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 554 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 2 Aug 2020
Writeuphelp
Writeup from MB 109:

Chwichiya 005        27º14.39’ N, 011º 40.12’W

Saguia el Hamra, Western Sahara

Find: 2019

Classification: Carbonaceous chondrite (CO3)

History: A single 249 g stone was found by Iken Mohamed in the Saguia el Hamra region of Western Sahara in 2019. John Higgins purchased the stone from Mohamed Elguirah in 2020.

Physical characteristics: Sample is dark brown in color, has a triangular profile with a rounded convex face and a flat bottom. The convex face is weathered and shows and irregular pattern of fractures. The cut face shows abundant small chondrules in a dark brown matrix.

Petrography: Description and classification (A. Love, App): Sample shows chondritic texture composed of chondrules with an average apparent diameter 208 µm (n=60), fragments mineral grains and abundant refractory inclusions, abundant sulfide and weathered metal set within a fine-grained, opaque matrix. Additional minerals are: plagioclase, Si-polymorph, troilite and oxidized FeNi metal.

Geochemistry: (A. Love, App) Olivine, Fa22.5±16.0 (Fa0.9-52.0), n=18. Cr2O3 Wt% in type II chondrules - 0.4±0.2, n=15); low-Ca pyroxene, Fs4.7±3.8Wo1.2±1.0 (Fs0.7-8.2Wo0.3-1.6, n=11); pigeonite, Fs3.5-5.8Wo7.4-5.3, n=2.

Classification: Carbonaceous chondrite (CO3, C-S2, W3) Based on texture, chondrule diameter and magnetic susceptibility this sample is an CO chondrite.

Specimens: John Higgins holds the main mass. An end cut, several smaller slices and fragments that comprise the 23.55 g type specimen and a polished thin section and mount are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Saguia el Hamra
Place of purchase:Morocco
Date:2019
Latitude:27º14.39' N
Longitude:011º 40.12'W
Mass (g):249
Pieces:1
Class:CO3
Shock stage:C-S2
Weathering grade:high
Fayalite (mol%):22.5±16.0
Ferrosilite (mol%):4.7±3.8
Wollastonite (mol%):1.2±1.0
Magnetic suscept.:4.92
Classifier:A. Love, App
Type spec mass (g):23.55
Type spec location:App
Main mass:John Higgins
Finder:Iken Mohamed
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:

Western Sahara
Coordinates:
     Recommended::   (27° 14' 23"N, 11° 40' 7"W)

Statistics:
     This is 1 of 89 approved meteorites from Saguia el Hamra, Western Sahara
     This is 1 of 219 approved meteorites from Western Sahara (plus 19 unapproved names)
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