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Canyon Diablo Carbon Nodule   contributed by Shun-Chung Yang, IMCA 2265   MetBul Link


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Photos by Shun-Chung Yang.   Copyright (c) Pictures may be used with attribution..
  Iron, IAB-MG

TKW 30 metric tons. Fall not observed. Impacted about 50,000 years ago. Found 1891 in Coconino County, Arizona, USA, between Flagstaff and Winslow.



   


Shun-Chung writes:
This is a carbon nodule weathered off from Canyon Diablo iron. Most of CD carbon nodules are composed of graphite - they can be split by kitchen choppers. However, this one is literally a devil! The carbon has been transformed to diamond (specifically, lonsdaleite) by the extremely high pressure and temperature when the iron hit the earth. It was almost uncuttable and ungrindable.

Craig Zlimen bought the whole nodule, and tried to halve and grind it. It instantly flattened diamond wheels, tore teeth off bandsaw blades, and bent diamond sintered blades. Finally, after months of scratching diamond on diamond he conquered this badass!

Fig. 1 and 2 a half piece in Shun-Chung Yang’s collection

Fig. 3 zoom in on the cut face

Fig. 4 the whole piece before cutting

Fig. 5 conversation between Craig Zlimen and Marlin Cilz


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Alexander Natale
 9/26/2022 5:31:26 AM
Great post and specimen. (nice pictures to!)
 

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