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: <[EMAIL PROTECTED]>
To: <[email protected]>
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
[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
