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Canyon Diablo   contributed by Paul Swartz, IMCA 5204   MetBul Link


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Copyright (c) Paul Swartz. All rights reserved.
373 grams.   Iron, IAB-MG

TKW 30 metric tons. Observed fall: no. Impacted about 50,000 years ago. Found 1891 in Coconino County, Arizona, USA, between Flagstaff and Winslow.



 


Paul writes:
This specimen underwent a hot water/aluminum foil/sodium carbonate galvanic cleaning process to minimize any chance of chloride rot from Lawrencite and/or Akaganeite. It seems to have produced a darker then normal color, too.

I learned on page 44 of the latest issue of Astronomy that in 1953 American geochemist Clair Cameron Patterson studied lead isotopes from uranium decay in a Canyon Diablo specimen to deduce the first accurate age estimate of the solar system - 4.55 billion years. A picture of a CD accompanied the article and was attributed to some guy named Robert Haag :)


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Bernd Pauli

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Bernd Pauli
 8/2/2016 2:22:49 PM
Re: Claire Patterson, see also J.G. Burke (1986) Cosmic Debris, Meteorites in History, Chapter 9: Contemporary Meteorite Research and Theories, p. 295.
M Schulman
 8/2/2016 12:15:28 PM
Awesome sample of CD!
Jansen Lyons
 8/2/2016 9:14:48 AM
Great individual and a unique side of history most wouldn't have known, myself included. Thanks Paul!
 

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