Cacholong is a type of stone that comes from the ground. It's white and kind of looks like a rock. People like cacholong because it's really pretty and can be used to make pretty things like jewelry.
Cacholong is special because it's made of something called "chalcedony." Chalcedony is a type of mineral that is formed when water and minerals mix together in the ground over a really long time. It's kind of like when you mix water and paint together to make a new color.
People have been using cacholong for a long time, especially in Russia where it's really popular. They like to use it to make special pieces of jewelry that look really nice. Sometimes, people also believe that cacholong has special healing powers, so they wear it to help them feel better.
So, cacholong is basically just a pretty white rock that people really like because it's made of a cool mineral and can be used to make beautiful things like jewelry.