Geologists: Are those bright, colorful geodes in red and blue naturally occurring or are the somehow dyed?

Question

Somebody told me they were dyed. I don't believe her. I think it is naturally occurring coloration of the rock.

Answer 1

Your friend is right. I don't know what they use to color them, but I do know when I purchase them for sale in my store, I am given the option of "natural" or "treated"

I know with Gemstones they use pressure and colored oil and/or heat and/or radiation to change their color - but I'm not sure about agates.

It would be easy enough to find out. Look up pelham-grayson on google, and call their customer service dept.

Answer 2

See?! I told ya!