the.com/bismuth

the heavy metal that grows rainbow staircases and quietly cures your indigestion

means A brittle, crystalline metallic element (symbol Bi) prized for forming iridescent stair-stepped crystals and used in compounds like the pink stomach-soothing one in Pepto-Bismol.

from From the German Wismut, a miners' word of uncertain meaning later Latinized to bisemutum by the 16th-century mining scholar Georgius Agricola — which is how we ended up with 'bismuth.' The German itself is murky; one guess ties it to wisse Masse, 'white mass,' but honestly nobody's sure what those old ore-diggers had in mind.

pretty crystals
Forms iridescent rainbow staircase patterns when cooled
in your medicine
It's the bismuth in Pepto-Bismol
barely radioactive
Once thought stable, decays over a billion universe lifetimes
defies physics
Expands as it freezes, like water does
least toxic
Surprisingly safe heavy metal, unlike lead neighbors
for instance

bismuth subsalicylate — active ingredient in pepto-bismol, used to treat digestive upset since 1901

bismuth-209 — stable isotope with longest half-life of any bismuth isotope, 1.9 × 10^19 years

bismuth crystal — geometric hopper crystals grown in labs, famous for iridescent oxide layers and cubic structure

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