This Looks Like Pyrite & Galena (in Quartz) To Me - Any Other Insights?

[Leon_UK]

Cracked this one open and there flakes of gold / blue / red & silver colors inside - I'm thinking it must be pyrite & galena? The rock is not especially heavy, especially when compared to others nearby where the galena had a darker blue color overall.

[Valens Legacy]

If you take a small screwdriver and try to crush/smash a piece of the yellow stuff it should not break.

If it is gold it will smash it rather than break.

Hope this helps as I hope that you have found some small gold.

Can you get a signal from your metal detector from it, if so what type of detector and what is the ID numbers.

[jasong]

Looks like some sulfides in quartz and maybe some type of cherty limestone host rock. Hard to tell from photos, especially on my small phone.

Chalcopyrite has a greenish black streak, pyrite has a brownish black streak, and galena has a gray streak. Best way to tell the 3 apart. A small streak plate is a great inexpensive investment if you are identifying minerals. 

[Leon_UK]

Thanks for the advice - I will try and crush a small piece to be 100% sure. I wasn't using a metal detector - just spotted a few chunks by eye at a river location. This one stood out the most.

Getting a streak plate sounds like a good, affordable idea to help with these 🙂