My guess is that it’s a metamorphic rock called gneiss. You can see banding, folding and breakage of some layers particularly in picture 2. Also looks to be brecciated. The formation this hand specimen came from has seen a lot of action. Minerals include quartz and possibly iron
Thank you! I’ve just had a read up on gneiss, followed by your suggestion; absolutely fascinating, “a history longer than life”- I thought highly of it anyway, but even more so now!My guess is that it’s a metamorphic rock called gneiss. You can see banding, folding and breakage of some layers particularly in picture 2. Also looks to be brecciated. The formation this hand specimen came from has seen a lot of action. Minerals include quartz and possibly iron minerals.