[Jewelry making - Article 00295] - Re: [Orchid] The Beilby Layer

[Tom]

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    Helen I am not a chemist but I had the Beilby layer explained to me
    many years ago. He was trying to understand how a relatively soft
    substance like tin oxide or cerium oxide could polish hard agate. In
    polishing jade he found that a well sanded peice would polish while
    one with scratches generated "orange peel" He decided that certain
    metallic oxides formed a molecular bont with the item being polished
    and "smeared" the top layer of molecules to create a polish 

Tom an old lapidary
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