[Jewelry making - Article 00169] - Re: [Orchid] Calculating gold content in Quartz?

[wemery]

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    You can make a VERY close estimate of the amount of gold in a quartz
    specimen quite easily If you have a long narrow graduated lab flask
    (graduated in cm), fill it half full with water  Drop in the
    specimen to learn the volume in cubic centimeters  Weigh the piece in
    grams The specific gravity of quart z is 277 That is, the specific
    gravity of quartz is 277 grams per cc Multiply the volume of the
    specimen x 277 and record this figure  Le t's say the volume of the
    specimen is 84 cc's 84 x 277  233 (grams) But when you weighed it,
    the piece weighed 37 grams  The extra weight is attributable to the
    gold  37 grams - 233 grams  137 grams I f the specific gravity of
    pure gold is 193, then 137 grams / 193 grams 0,71 grams of gold in
    the specimen Now, if you DON'T have a graduated flask in which to the
    measure the volum e of the specimen, you need to calculate the volume
    using some solid geometr y methods  If you have a CAD program like
    Matrix (wwwgemvisioncom), and the piece is of a shape that you can
    fairly closely reproduce, Matrix will calculate the volume of the
    solid object for you and will calculate the weight as well, so you
    don't even need a scale! Matrix rules 

Wayne Emery

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