Cambrian blue clay was derived from Siberian lakes during the Cambrian period (which dates back as far as 541 million years ago!). This makes it one of the oldest and rarest cosmetic clays in the world, which in itself is rather special. It gains its distinctive blue hue from the algae and minerals that it contains, which help with a multitude of skin irritants. This rare, mineral rich clay is super detoxifying and absorbent, acting like a sponge soaking up unwanted dirt and oil from your skins surface as it dries.