agates, silicon dioxide, SiO, chalcedony, mexican moss agate,, photo

Mexican Moss Agate


There are many different types of agates found around the world and they are often named after the location they were found or their appearance. Agates are composed of Silicon dioxide (SiO2) and they form as layers of chalcedony in the host rock. I much prefer the more romantic notion of seeing it as a distant galaxy albeit on a micro scale. Photo © copyright by Graham Chalmers.

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