[Jewelry making - Article 00020] - Re: [Orchid] Holly Blue Agate Vs Chalcedony?

[Carol Carter-Wientjes]

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Hi Noel,

    Both are in the quartz family and agate is a type of chalcedony
    (where the confusion starts, I think!) Chalcedony is a single colored
    material whereas agate is multi-colored with fortification or a
    banded pattern to it. Based on that, the fortification in Holley Blue
    makes it an agate. Check this out for more details: 

    http://minerals.net/mineral/silicate/tecto/quartz/varietys/agate.htm

Hope that helps, Carol


 
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