I'm just beginner please help me.

[pattypat]

I have this stone and I crushed it and made a powder out of it, I used aqua regia to it and waited for 1 day, after that I filtered the solution and followed some steps of youtubers to get rid of the nitric oxide and other excess nitric ions on it and I boiled the solution that i filtered and added some urea to it while boiling after that the solution turned black and I worried that it fails so I added a bit of diluted smb to it and small amount of distilled water I boiled it for awhile and I got this please help me if this is correct. I don't have stannous chloride to check whether there's a gold in it but it now there's small brown sands that precipitated at the bottom. As you can see from the photo, it doesn't clung just a sand pls help.

 

[Lino1406]

According to what said, the mud is soluble in HCl. Take a sample under hood, add HCl, heat. See if brown particles remain...

 

[pattypat]

According to what said, the mud is soluble in HCl. Take a sample under hood, add HCl, heat. See if brown particles remain...

yes it does remain and settle at the bottom

 

[Lino1406]

Melt or cupelate to see if it is gold