the.com/selenite
a crystal named for the moon that dissolves quietly in the rain it pretends to outlast
moon namesakeNamed for Selene, Greek goddess of the moon
water-solubleDissolves in water despite looking eternally solid
soft mineralScratchable with a fingernail, ranking 2 on Mohs
giant crystalsMexico's Naica cave holds 36-foot selenite beams
actually gypsumJust crystallized gypsum, same stuff as drywall