Selenite is a type of rock that looks shiny and clear, like glass. It is made up of a mineral called gypsum, which is found in places where there used to be water.
Selenite is a special type of gypsum because it forms into long, flat crystals that look like sheets or blades. These crystals are so clear that you can almost see through them!
People like to use selenite as decorations because it looks very pretty in the light. Some people also believe that selenite can help them feel calm and peaceful.
When you touch selenite, it feels smooth and cool. But because it's a rock, you have to be careful not to drop it or it could break.
Overall, selenite is a really cool and beautiful rock that can brighten up any space it's in!