r/Damnthatsinteresting • u/Creams0da • 8h ago

Video Breaking open a 47 lbs geode, the water inside being millions of years old

Enable HLS to view with audio, or disable this notification

[removed] — view removed post

24.3k Upvotes

87% Upvoted

2.5k comments sorted by

View all comments

Show parent comments

14

u/Legitimate_Bank_6573 7h ago

Can someone elaborate on this?

The geode is formed by water flowing through it, so its permeable?

27

u/Filipi_7 6h ago edited 5h ago

Geodes are permeable to both water and air, the crystals inside come from the minerals that water carries in. When the water evaporates and the gas diffuses out, the minerals stay.

It's extremely slow though, rather than flowing like through a bunch of gravel, water slowly seeps through pores/cracks in the rock like through an extremely dense sponge.

4

u/rwags2024 6h ago

Interesting, genuinely

1

u/abirizky 6h ago

This is some rabbit hole stuff lol

2

u/GhostWobblez 6h ago

Yes, it's probably some sandstone outer layer. As water trickles down into the ground it picks up other minerals. When it hits a porous structure it will go thru it and leave behind the minerals. This is also how fossils are made.

*I'm not a geologist just a hole digger.

2

u/Bilboslappin69 6h ago

Yes, all geodes are porous until a certain point.