I'm posting mostly to see what others have to say about this. If it's fragile, I don't think it's gold. Kind of looks like pyrite to me, but I hope I'm wrong.
If you can tap it lightly with a hammer, and anything breaks off, it is not gold. Gold will either sit there and laugh at you (depending on how hard you hit it), or slightly flatten.
Definitely not mica or pyrite its tests postive for trace amount of tellarium and pin goes through it it flakes off at the cleavage. Let me send you another some other specimens all found with 20 yards of each other: First pic is Mica compressed, weathered that had some silver and gold also. Not sure on others. Sorry these are all bad pics. I have tellurides up the wazoo. I know gold can float, host other minerals blah blah blah and can change properties with impurities but this has a specific gravity of about 11 (more that tellurides) Postive test for gold was done with same piece put in auric chloride form and tested with SNCL2 light purple (like the tellarium test with sulfuric) I did not test for silver. I do live on a fault line and have an illuvial almost vertical deposit from hypothermal activity. Its the twilight sone here. Any help on others?
I have found gold can come in any shape, siz,e color, host rock and it floats (bonds with other elements , but not chemically) I have to grind to 200 mesh or more the leach all values.
If your fingers smell like garlic after handling the rock, dig baby dig!
Simply by your streak it looks rich.
Just my guess middle west Colorado or Western Aussi. Que' No!?