13. Wonderful! The geologist in me loves stuff like this
I took a field trip to a lead mine in Missouri when I was in college, there was a solution cavern off to the side of ne of the mine shafts, it was lined with quartz and calcite crystals like this. NOt so staggeringly huge but with a rainbow array of colors.
The professor called it a "glory hole."
Nobody smirked at the term--at least on the outside! Of course looking at these pictures I think they might be a more wonderful use of the term.
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