December 14-16—SAN DIEGO, CALIFORNIA: Wholesale and retail show; Gem Faire Inc.; Scottish Rite Center, 1895 Camino del Rio S; Fri. 12-6, Sat. 10-6, Sun. 10-5
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 Post subject: strange magnetic stone
PostPosted: Wed Feb 28, 2018 3:59 pm 
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Hi, my buddy was panning the McFee Creek in North West Michigan. He told me he found magnetic garnets that would stick to a magnet. I said impossible. He showed up yesterday and pulled these little gemstones out of his gold. We cleaned them, 1mm in size or less. I put my magnet to them and they stuck. I then took them to do a white paper test, I could see refraction coming from them. Under intense light they show colors of orange to pink, florescent they are dark red. What other tests can I do, no red under the Chelsea filter either, because he pulled out red corundum too and that showed up clearly. He said these little stones were heavy like magnetite and gold.
Just a curious mind.
Scott


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 Post subject: Re: strange magnetic stone
PostPosted: Wed Feb 28, 2018 8:03 pm 
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Hi Scott and welcome.
I moved this to a more appropriate category.


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 Post subject: Re: strange magnetic stone
PostPosted: Wed Feb 28, 2018 8:35 pm 
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Pyrope-almandine garnets won't fluoresce, but if you're using near-UV LEDs it's not hard to get a false positive for subtle fluorescence. Just the other day a jeweler was telling me about using neodymium magnets to collect garnets from a creek.


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 Post subject: Re: strange magnetic stone
PostPosted: Thu Mar 01, 2018 1:07 pm 
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Stephen Challener wrote:
Pyrope-almandine garnets won't fluoresce, but if you're using near-UV LEDs it's not hard to get a false positive for subtle fluorescence. Just the other day a jeweler was telling me about using neodymium magnets to collect garnets from a creek.

Thanks Stephen


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