[Jewelry making - Article 00015] - Re: [Orchid] Calculating gold content in Quartz?

[Steve Green]

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    Peter, To get an approximate calculation of the gold content in
    quartz this is what you would do: 

    A) Figure out the volume of the quartz/gold specimen. This is
    easiest done using water displacement. Or by weighing in air and
    then in distilled water. (There are special scales that do this.)
    Subtract one weight from the other to give you the weight of the
    displaced water. Then you can find the volume of the specimen since
    we all know that one gram of distilled HOH is equal to a cubic
    centimeter. With this you can find the volume of the quartz/gold
    specimen. 

    B) Obtain the actual weight of the quartz/gold specimen. A triple
    beam will do. 

    C) Figure out what the specimen should weigh if it were pure quartz.
    This is done by using the known volume of the specimen and the know
    specific gravity of quartz. 

    D) To get the approximate weight of gold in the quartz/gold specimen
    you would then subtract the above C from the above B . The difference
    will give you an approximate weight of gold in the specimen. 

    This is only approximate since it cannot take into account any voids
    (hollow areas) in the specimen, other minerals present with
    different SGs, any metals alloyed with the gold, etc. 

    Hope that helps  : )  Steve Green / Rough and Ready Gems For all
    your colored gemstone BRIOLETTE needs and precision ultrasonic
    drilling. See us in Tucson at the GJX Show booth # 700, Feb 6th-11th
    2003 (across from the AGTA)

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