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Author Topic: Is this rock I found GOLD?  (Read 4608 times)

Offline goldy

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Is this rock I found GOLD?
« on: 09/04/2009 02:19:35 »
While hiking I found this rock.  Is this for real? Thanks for the help.


 

Offline Bass

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Is this rock I found GOLD?
« Reply #1 on: 09/04/2009 02:33:51 »
Possibly.

Looks more like either pyrite or chalocpyrite in the photo.  Can you scratch the metallic mineral easily with a knife?

If you can't scratch it (or barely scratch it)- it's pyrite
If you can scratch it, but not easily and flakes break off, it's probably chalcopyrite
If it scratches very easily and leaves a groove, but no flakes, it's gold
 

Offline JimBob

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Is this rock I found GOLD?
« Reply #2 on: 09/04/2009 05:17:08 »
And if the white streak cannot be scratched it is probably quartz.

(I just need to seem intelligent.)
 

Offline Bass

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Is this rock I found GOLD?
« Reply #3 on: 09/04/2009 05:47:23 »
And if the white streak cannot be scratched it is probably quartz.
Demonstrating your profound grasp of the obvious:-\

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(I just need to seem intelligent.)
Did it work??  ??? ???
 

Offline Raghavendra

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Is this rock I found GOLD?
« Reply #4 on: 09/04/2009 07:39:47 »
You should ask for geology student?
 

Offline Bored chemist

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Is this rock I found GOLD?
« Reply #5 on: 09/04/2009 12:58:32 »
Why ask for a geology student when you can ask a fully fledged geologist?
Anyway, since finding out what things are made of is part of analytical chemistry, perhaps I can add my 10 cents worth.
If it dissolves in nitric acid it isn't gold. (Ever wondered where the phrase "the acid test" came from?)
It's still a pretty rock.
 

Offline JimBob

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Is this rock I found GOLD?
« Reply #6 on: 09/04/2009 14:21:20 »
Right Bored - Both Bass and I were geology students about 100 years ago. And BC is also correct - only freshly mixed concentrated nitric acid and concentrated hydrochloric acid, usually in a volumetric ratio of 1:3 respectively (Aqua regis) -  can dissolve gold.

And if the white streak cannot be scratched it is probably quartz.
Demonstrating your profound grasp of the obvious:-\


The poster did not make that apparent nor did you, Captain Querulous. Just helping out here.

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Quote
(I just need to seem intelligent.)
Did it work??  ??? ???

No.
 

Offline goldy

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Is this rock I found GOLD?
« Reply #7 on: 10/04/2009 17:45:31 »
Thank you for the information.  I haven't tried the tests yet.  I might take it to a jeweler and ask.
 

The Naked Scientists Forum

Is this rock I found GOLD?
« Reply #7 on: 10/04/2009 17:45:31 »

 

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