[Jewelry making - Article 00785] - Re: [Orchid] Red tiger eye

[coralnut]

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>     there is also a metamorphosed tiger eye called petersite and occurs
>     in red blue and yellow.... Ringman 

    True Ringman, but....I believe petiersite is something different
    though related.  Tigereye actually derives from crocidolite, an
    asbestiform or riebeckite.  The crocidolite is replaced fy silica,
    hence it is quartzified. 

    Petersite (possibly correctly spelled Pietersite but also seen as
    Petiersite)  is, I believe, related but has a different fiberous
    construction.  I have checked every one of the mineral books in my
    library but cannot find a reference to Petiersite (or
    petersite/pietersite). 

    On the other hand, I found a site known as Kashmere Blue" on line
    with the following write-up: " Pietersite was first discovered by Sid
    Pieters in 1962 while prospecting farm land. He registered the find
    in the mineral records of Britain, which was published in 1964 naming
    the material Pietersite. 

    Pietersite is formed from a crocidolite type asbestos or variety of
    Riebeckite. The process begins with Hawk Eye, the name given to the
    blue variety of Tiger Eye. This opaque aggregate is formed when
    quartz replaces the blue/green mineral crocidolite creating
    iridescent planes or fractures with a silky luster. Tiger Eye is
    created when the iron from the decomposed crocidolite oxidizes
    changing it to a golden brown color. Pietersite is then formed by a
    process known as brecciation. This occurs when the fibrous structure
    of both Tiger Eye and Hawk Eye are broken via the earth's geologic
    process. The tiny fragments are later naturally cemented together by
    quartz creating a finished product with multiple hues and superb
    chatoyancy. " 

    Cheers from Don at The Charles Belle Studio in SOFL where simple
    elegance IS fine jewelry! dcdietz AT comcast.net


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