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.
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![IMG_20190911_214850.jpg IMG_20190911_214850.jpg](https://www.treasurenet.com/data/attachments/1575/1575360-20e0405adc5e952c4f08946f0f1f2116.jpg)
![IMG_20190911_214702.jpg IMG_20190911_214702.jpg](https://www.treasurenet.com/data/attachments/1575/1575388-3fddfd83fae780daedecd5a3383d5a26.jpg)
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