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The spessartine garnets are like Buckyballs, but with far fewer faces. Here's Wikipedia's article on them, with a good typical picture. Less spherical than Buckyballs but way more than, say, quartz....

Hi Knife,

Yes, barber's hones are almost all synthetic. The thing that makes them "barber's hones" is mostly size, that they can fit in a shirt pocket. When the barber feels the razor start to...