[meteorite-list] Size of diamonds in meteorites
From: MarkF <mafer_at_meteoritecentral.com>
Date: Wed May 11 16:44:27 2005 Message-ID: <003501c5566a$018d80a0$0408e104_at_MAF> Hi Bernd and List I've been reading about this and have to wonder if its diamonds at all. It may be that what has been experienced is a combination of factors, not the least of which is simple rock density itself. Add to this silicon carbide crystals, nano-diamonds and you have the makings of a first class blade destroyer. I've run into cherts that will astound those that cut meteorites because a chert is just a quartz, and should be no problem for a diamond blade. But check those ribbon cherts from the Pacific North West (Ross Lake) against other forms of chert or quartz, or other rock types period, to see what I mean. If you push too hard, that variety of ribbon chert will strip the diamond off the best of blades and you could cut sapphires quicker to boot! Mark F ----- Original Message ----- From: <bernd.pauli_at_paulinet.de> To: <Meteorite-list_at_meteoritecentral.com> Sent: Wednesday, May 11, 2005 4:22 PM Subject: [meteorite-list] Size of diamonds in meteorites > Hello David, Adam, and List, > > I'm sorry for my late response but we are very busy with our > preparations for our family trip to Lake Constance tomorrow. > > David Weir kindly wrote: > >> Perhaps Bernd could check his >> extensive resources for more info > > So here goes: > > HILL H.G.M. et al. (1997) Infrared spectroscopy of interstellar > nanodiamonds > from the Orgueil meteorite (Meteoritics 32-5, 1997, 713-718, excerpts): > > "To date, the only diamonds identified that are almost certainly of > extrasolar > origin are those that survive in the matrices of primitive meteorites > (Lewis > et al., 1987; Anders and Zinner, 1993; Ott, 1993). Typically 1-3 nm in > size > (1 nanometer = one billionth of a meter), they are present in abundances > of > up to ca. 1400 ppm ... Meteoritic nanodiamonds, with typical dimensions in > the range of 1-3 nm, are significantly smaller than the diamonds in > diamond > powders". > > Best wishes, > > Bernd > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list_at_meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list Received on Wed 11 May 2005 04:42:52 PM PDT |
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