Thank you so much
For some reason I couldn't find literature on this topic, despite it's essential for health. I own a lot of those stones, and sometimes I keep them in water. I only drank the water once and after that was totally scared that there might be a poisonous stone in there.
Especially thanks on the information about Mohawkite. My daughter likes to play with this stone, she would never put it in her mouth though, but you never know. I will hide it from now on.