Coesite from the Richat Dome, Mauritania: A Misidentification

@article{Fudali1969CoesiteFT,
  title={Coesite from the Richat Dome, Mauritania: A Misidentification},
  author={Robert F. Fudali},
  journal={Science},
  year={1969},
  volume={166},
  pages={228 - 230}
}
  • R. F. Fudali
  • Published 10 October 1969
  • Geology, Medicine
  • Science
The "shattered sandstone" from Richat reported to contain coesite is a tectonic breccia and probably represents a shear zone developed during the structural doming. An optical and x-ray examination of concentrates from this breccia demonstrated that the supposed x-ray reflections of coesite are actually due to barite, introduced into the permeable crushed zone by groundwater. 
3 Citations
The convincing identification of terrestrial meteorite impact structures: What works, what doesn't, and why
Abstract In the geological sciences it has only recently been recognized how important the process of impact cratering is on a planetary scale, where it is commonly the most important
Meteorite Impact Structures in the Arab World: An Overview
This chapter provides an up-to-date review about confirmed, proposed, and disproven meteorite impact structures in the Arab countries. Among the ~190 confirmed impact structures/sites on Earth, only
Impact structures in Africa: A review
TLDR
This work presents a comprehensive review of confirmed, proposed (possible) and disproven impact structures in Africa.

References

SHOWING 1-5 OF 5 REFERENCES
Minor epigenetic, diagenetic, and syngenetic sulfide, fluorite, and barite occurrences in the central United States
Metallic sulfides, fluorite, barite, and celestite are widespread in the sedimentary rocks of the central United States. Many occurrences are epigenetic concentrations either in known major mineral
High-pressure region of the silica isotypes
The region extending from ambient conditions up to approximately 600° C and 60,000 bars has been examined for the various polymorphs of S i 0 2 , and for B e F 2 , A1P0 4 , A1AS04, A1V04 , MnAs0 4 ,
CLiKa radiation; Ni filter; diameter of camera tused to determine the x-ray powder pattern. 114
Pomerol for supplying the specimen for analytical work, R. S. Dietz for obtaining the specimen for me
Sample obtained from C. Pomerol; his specimen No