[Jewelry making - Article 00071] - Re: [Orchid] Agate or Jasper?

[Diane Sadel]

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    Hi Dave, The best description I found in regard to agates and jaspers
    was in "Fifth Edtion GEMS  Their sources Descriptions and
    Identification" by R. Webster 

    From what I read I understood the following: 

    It seems that Jasper is a more dense material.  Banding is present
    in jasper however in agates the banding is concentric. 

    The book also mentioned that Jasper appears in heavy sedimentary and
    metamorphic conditions and with iron ores, cavity filling, or
    nodule.,whereas agate is found igneous or lava situation and
    possibly formed of deposits of silica in cavaties.  Colors in agate
    are usually light.  (Onyx is also an agate) 

Diane Sadel
http://www.sweetgemstones.com

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