Identification - quartz and hematite?

[ch3llou]

I found this on a beach near Otter Ferry, Scotland. I'm inexperienced at identification so I was hoping someone else knew the answer. To me it looks like quartz with some sort of iron/hematite in the middle, but what do I know? I'm particularly interested in what the brown wavy stuff is. I'd love to cut it open to have a look inside but I don't have any tools to do so.

 

Amazon Forum Fav 👍

Cry Of The Eagle: History And Legends Of The Cherokee Indians And Their Buried Treasure - Grab it through Amazon!

[RTR]

Five pound sledge hammer,a rag over the rock,and eye protection.In a few seconds you'll know whats inside .