Hundreds of feet below a Russian city is an abandoned salt mine which might as well be the inside of a rave. The walls are covered with psychedelic patterns, caused by the natural layers of mineral carnallite creating swirls throughout the coloured rock. Carnallite is used in the process of plant fertilisation, and is most often yellow to white or reddish, but can sometimes be blue or even completely colourless.
Via Tai Wiki Widbee
Really cool.
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