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Thread: Extracting topaz pebble from quartz gravel and pebble

  1. #1 Extracting topaz pebble from quartz gravel and pebble 
    Forum Sophomore
    Join Date
    Oct 2010
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    171
    I have been proposed a bucket of sand pretty rich in topaz (alluvions from northern Nigeria) for a ridiculous price (less than 40 $). I randomly sampled the sand, even deep inside and found 4 topazes bluish, good clarity, around 1-1.7 cm diam, about 5-8 grams each.

    So they are there.

    The problem is that there are not enough to make a significant difference of density in this sand (knowing I don't have the humidity % nor the other heavy components, there are quite a large amount of darkish things).

    Knowing the bucket is a big paint bucket of 50 cm height by 30 cm diam, what volume should I sample to get a good idea ?
    Or any other easy to assess the probable volume of topaze ?


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  3. #2  
    WYSIWYG Moderator marnixR's Avatar
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    this piece of advice goes beyond the boundaries of earth sciences : "if something seems too good to be true, it usually is"


    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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