[meteorite-list] OT: cubes and their history? Contest with Prize!!!
From: Eduardo. <rockhoundm_at_meteoritecentral.com>
Date: Mon Feb 21 06:33:46 2005 Message-ID: <20050221083195.SM00215_at_WorldClient> Hi Dirk and list I have in my collection two Nantan specimens with cubic crystals of Magnetite (I make an x-ray diffraction on them so I'm 100% sure) I had a 300g specimen in my collection for about 7 years, one day after about 2 years, I picked it up and it split in two!, in the fracture, almost 50% of the new surface was covered by very sharp cubic microcristals, some of them somewhat iridiscent. I gave a sample to a friend who made the XRD and confirmed it was magnetite. About 2 - 3 years ago at Tucson show a chinese dealer was selling very rusted nantan specimens, I checked em all and one of the pieces had lots of those cristals on the shale. I don't know if this count for you as they are not in the meteorite itself but in the rusted shale part. But as I consider Hoba shale, and Santa Catharina as meteorites then for me this are cubic crystals in a meteorite. Eduardo -----Original Message----- From: drtanuki <drtanuki_at_yahoo.com> To: meteorite-list_at_meteoritecentral.com Date: Sat, 19 Feb 2005 07:07:42 -0800 (PST) Subject: [meteorite-list] OT: cubes and their history? Contest with Prize!!! > List, > The NBS (Nationial Bureau of Standards) US maintains > the universal standard cubic centimeter as well as > all standards, metric and US standards in their very > precise, expensive and highly guarded collection. > Most likely many other countries have their own > Standards collection. > The history of the use of a cube dates at least to > 4000 B.C.? or earlier in Egyptian culture...in the > form of dice? and building blocks; but was not only > unique to their culture. Early Chinese also had their > standard cube by at least 2000 B.C. > The "idea" of the cube probably came from observing > natural cubic pyrite or other minerials with a cubic > habit. > The first use of the cube associated with meteorites > perhaps was by the Japanese in Antartica. Caveat: I > may be incorrect. > Quiz: Do cubic forms exist in meteorites and in > which minerials? A prize will be rewarded for the > most correct and detailed answer. Thank you and cube > on, Dirk Ross....Tokyo > > > > __________________________________ > Do you Yahoo!? > The all-new My Yahoo! - What will yours do? > http://my.yahoo.com > ______________________________________________ > Meteorite-list mailing list > Meteorite-list_at_meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list Received on Mon 21 Feb 2005 06:31:26 AM PST |
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