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For some awesome viewing pleasures, I recommend the following image search strings:
Russian Salt Mine
This will get you pictures showing a mineral called carnallite, a hydrated potassium magnesium chloride, in bands with halides. The carnallite is vivid orange and yellow, while the halides tend to be white.
Salt Mine Cathedral
This will get you the very famous underground churches carved in Polish salt mines. Adding the word 'Colombia' to the search string shows images of a salt mine turned tourist attraction with both carving and lighting.
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