Whirlwinds of crystals called gravel devils spotted in Andes Mountains
Large hunks of gypsum swept between two volcanoes
![a gravel devil](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/04/040517_ts_gravel-devils_main_free.jpg?fit=860%2C460&ssl=1)
CRYSTAL SWIRL Swirling winds in the Andes Mountains can carry gypsum crystals several kilometers before dumping them in large piles.
K. Benison/Geology 2017