[Jewelry making - Article 00654] - Re: [Orchid] Blue quartz

[jake]

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     Blue quartz is not topaz. Check any gemology site. Quartz, amethyst
     or citrine, etc., is SiO2, trace elements are the difference in
     color etc. Topaz is Al2 SiO4 (F,OH)2 + Cr, as anyone can see,
     totally different, cuts different, different hardness and other
     properties. Also see IGS reference library for Chalcedony, it
     answers some other questions for quartz materials. 

     Blue quartz occurs naturally, much is dyed, what is very rare, and
     then only in small pieces is faceting grade. This last has a name,
     not sure and won't bother looking it up, but have see reference to
     it in a reprint from the library of a book published (originally)
     early last century.

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