[Jewelry making - Article 00556] - Re: [Orchid] Are these really Garnets?

[AvA]

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Hi Nan,

    I believe them to be trade names for garnets being mined and/or
    traded in India. Google for the names alone and you'll end up in
    India. The Orissa is Almandine garnet if I understand correct. 

    The garnet group consists of 6 main members divided into two groups: 

    1: pyralspite (pyrope-almandine-spessartine)
    2: ugrandite (uvarovite-grossular-andradite) 

    These are isomorphous groups, meaning that some of the endmembers
    can be part of the structure in one crystal. For instance
    pyrope-almandine is an isomorphous serie and somewhere in between
    lays rhodolite. 

    Other series are pyrope-spessartine, spessartine-almandine,
    pyrope-grossular and grossular-andradite. 

    In those series you can fine intermediates with names as melanite,
    malaia, tsavorite, hessonite, mali, topazolite, demantoid,
    mandarine, hollandine, kashmarine, maralambo and color-change. 

    Those are the names recognized I believe. The rest are trade names. 

    We did a few chats on them a while back, you can read the logs at
    http://yey.be/yglogs/yglog45.cgi, http://yey.be/yglogs/yglog46.cgi
    and http://yey.be/yglogs/yglog47.cgi (Dr. Hanneman attended that one
    incognito). 

Hope that helped,
Alain

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