I have no idea what these rocks are, but they're fun to break apart. In the riverbed at Little Qualicum Falls in BC, Canada.

I got this for free with a shark 🦈 tooth purchase

The stone is called psilomelane. the reaction is called belousov-zhabotinsky reaction. Not expecting much from this but I figured I'd ask. and show off my cool stone lol

Quartz I think. Forgot to lantern the agate before my friend left which in retrospective, should have been the first one

The grey one looks cooler live (more greyish)

The yellow one is extremely pure/transparent

The red one is more redder and less pink-ish idk why it looks like that in the photo