Cave Pearls - National Speleological Society
caves.org
Pearls are a concentric concretion found in shallow cave pools. They are typically spherical, but can also be cylindrical, elliptical, and even cubical as in the bottom right photo. They…
The original post: /r/todayilearned by /u/K3Y-LXME on 2024-12-08 06:07:02.

Original Title: TIL about cave pearls, naturally formed rolled stones that take hundreds of years to create, made from dripping calcite deposits hitting small pieces of material in stasis, which causes a constant, even growth on all sides.