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No. 92: Mar-Apr 1994

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Diamonds are an anomalist's best friend

The diamonds we mine today were, according to prevailing wisdom, formed about 3 billion years ago, at depths of 150-300 kilometers, where pressures of 725,000-1,000,000 psi are believed to exist. After lengthy cooling periods, the crystalized diamonds were transported to the surface by fluid, lower-melting-point rocks, such as kimberlite. Many South African diamonds are mined from kimberlite pipes.

Diamonds are never pure carbon; they always contain some nitrogen and boron. Occasionally, they harbor tiny radioactive impurities; usually alpha-particle emitters in the uranium-238 decay chain. Alphas emitted by these impurities have well-defined energies and penetrate the diamond matrix only so far. If one examines a diamond with a high-power microscope (say, at 100 x), one can see concentric rings surrounding the impurities. These dark radiohalos or "pleochroic" halos have specific radii and can be used to identify the radioisotopes that produced them. So far, so good; but:

"The fact that fully formed, optically visible internal radiohalos in diamonds are now presented casts a considerable shadow over current theories of diamond genesis."

Actually, the radiohalos pose three challenges to diamond-genesis theory.

Problem 1. The half-lives of the halo-creating radioisotopes are measured in thousands of years rather than the billions prescribed for crystallization. In fact some of the half-lives are only minutes or days long. M.H. Armitage comments:

"How could these halos become imprinted if the formative cooling processes involved require such lengthy intervals?"

Problem 2. The radioactive impurities producing the radiohalos are very tiny -- about 2-4 micrometers in diameter -- and are highly concentrated. Armitage continues:

"What is most difficult to understand is that many of these inclusions and impurities have much lower melting and boiling points than the diamonds in which they are found."

Why did the impurities fail to disperse as the higher-melting-point diamond matrix surrounding them slowly cooled down the eons?

Photomicrograph (of hollow tubes in a diamond
Photomicrograph (100x) of hollow tubes in a diamond
Problem 3. Some diamonds contain a strange, rectangular latticework of radiation-stained hollow tubes. Some of the tubes terminate in radiohalos; some do not. Some reach the crystal surface; most don't. What are these tubes and how could they retain their intricate structure during diamond genesis?

(Armitage, Mark H.; "Internal Radiohalos in a Diamond," American Laboratory, p. 28, December 1993. Cr. N. Ethridge.)

Comments. More on the radiohalo problem can be found in Science Frontiers (the book, p. 213) and under ESP1 in Anomalies in Geology. Ordering information for both of these books is located here.

Note, too, that creationists employ radiohalos to attempt to prove that the earth is really young. Finally, American Laboratory is one of the thousands of journals we have not examined. It is painfully obvious that, even with some 40,000 journal volumes reviewed, we have much farther to go!

From Science Frontiers #92, MAR-APR 1994. 1994-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:


  • "A sourcebook of unexplained phenomena is therefore a valuable addition to a collection of scientific literature. William R. Corliss has provided this in the past with his source books of scientific anomalies in several subjects, and now he has provided it for astronomy. He has done an excellent job of collecting and editing a large amount of material, taken in part from scientific journals and in part from scientific reporting in the popular or semi-scientific press." -- "The Mysterious Universe: A Handbook of Astronomical Anomalies", reviwed by Thomas Gold, Cornell University, in Icarus, vol.41, 1980

  • "An interesting, systematic presentation of unusual weather [..] This book is recommended for a general audience" --"Corliss, William R., Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena, Sourcebook Project, 1983.", revieweed in Choice, September 1983
  • "..the science is necessarily somewhat speculative, but Corliss's symthesis is based on reputable sources." -- "Corliss, William R. (Compiler). Lightning, Auroras, Nocturnal Lights, and Related Luminous Phenomena" reviwed by Joseph M. Moran, Univ. of Wisconsin in Science Books and Films, Sep/Oct 1983

  • "Before opening the book, I set certain standards that a volume which treads into dangerous grounds grounds like this must meet. The author scrupulously met, or even exceeded those standards. Each phenomenon is exhaustively documented, with references to scientific journals [..] and extensive quotations" -- "Book Review: The moon and planets: a catalog of astronomical anomalies", The Sourcebook Project, 1985., Corliss, W. R., Journal of the Royal Astronomical Society of Canada, Vol. 81, no. 1 (1987), p. 24., 02/1987