Joined: Wed Sep 19, 2012 1:35 pm Posts: 9 Location: South Africa
Hi there,
I have a type of gold dust which we discovered here in my home town, it is the colour of gold, it is small gold flakes, if I heat the flakes nothing happens, if I apply 80% acid on the flakes also nothing happen.what also happen when I leave it in the 80% acid for 24 hrs no results.
It cannot be copper right? otherwise it would of melted when I applied 1300 c on it, so I am so confused don't know what it is and I have plenty of the flakes.
Then again, heating also probably eliminates pyrite/fool's gold: because if you heat that stuff hot enough, you'll likely know (and likely regret it--the smell is terrible).
Same thought here. Mica is one of the few golden looking things that might come through fire unscathed.
Also - as an aside - I was going to mention that in my first post but hesitated thinking well maybe I might be wrong, don't wanna make a fool of myself...you know. So all those voices suggesting mica is a pleasant confirmation. Of course we might ALL be wrong.
most common natural ones: mainly pyrite, chalcopyrite, mica (which might all occur in a gold deposit btw)
artificial: industrial waste material such as brass and bronze
differences: malleability, density, hardness, solubility in nitric acid (dangerous acid!)
let's note that pyrite and chalcopyrite usually do not contain any gold, however auriferous pyrite and auriferous chalcopyrite (which contain a little gold as an impurity) do exist and can be extracted as a gold ore (then requiring chemical refining to extract the gold out of it, but that means processing tons of ore to recover only a single gram of gold)
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