Please help me identify this rock, any advice will make my entire week, or month!

[Metalf*ingMusic]

Hello, I live in Phoenix, AZ, I recently helped my Dad tare down the rock wall that has been in our front yard since we first moved in, 13 years ago. It was a beautiful wall, but he decided to expand. Not only were there rocks on the exterior, but 100's were cemented on the inside as well. Beautiful turquoise, football-sized pieces of numerous quartz, pyrite, every kind of rock imaginable. Then, I came across a rock that was very different, much heavier than the other rocks, It's very strange, and any advice would be appreciated. I broke a few chunks off, which, was very difficult, it's definitely solid, nearly unbreakable. I put a magnet to it and, (not a very good magnet) and only a tiny spec of rock stuck to it. The rock wall was built before the 1950's. Thats all I know. Please, any advice is much appreciated, I'm stuck between a rock and a hard place Thank you.

 

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[grasshopper]

Can't help you unfortunately, but welcome.

Might want to try posting on the rock forum as well if you don't get any responses here

Rocks/Gems

 

[Metalf*ingMusic]

Heres a photo with a view of the inside from a little hole I drilled. View attachment 1731747

 

[Metalf*ingMusic]

Okay. Thank you so much! I appreciate it.

 

[A2coins]

Definitely a cool find

 

[Metalf*ingMusic]

Thank you. I agree.