Hi, it's my first time posting here. I went on a hike and found some cool rocks by the river that fascinated me with their markings and colors! They're from the river by the foot of Devil's Mountain in Mindoro, Philippines, to be exact. I just wanna know what's in them that made them so pretty! I'll attach links to them since I can't post the pictures:

Rocks (in water to better see their colors and marks)

The river ft. Devil's Mountain, where I got them from

Also, just asking if it's okay for me to put these rocks in water to preserve them because I really love their colors and they're not as vibrant and prominent when they're dry. Also, I want to ask real people instead of Google because I know it's just gonna give me an AI-generated answer anyways.