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Quartz
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Minerals and gems
Silica
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Millions of years ago hot water was trapped inside this crystal as it cooled and contracted... this vapor bubble was formed inside the quartz. : interestingasfuck
https://www.reddit.com/r/interestingasfuck/comments/y00zaq/millions_of_years_ago_hot_water_was_trapped/
Quartz
Quartz - Wikipedia
https://en.wikipedia.org/wiki/Quartz
Quartz
r/geology - Giant Arkansas Quartz Crystal
https://www.reddit.com/r/geology/comments/adhxiv/giant_arkansas_quartz_crystal/
Arkansas
Quartz