Olivine

Olivine is a special type of rock mineral that comes from deep beneath the Earth's surface. It's usually green or brown in color and is made up of a bunch of different elements. Olivine is like a building block for other rocks because it can easily transform into other minerals. But don't worry, you don't have to remember that! Just think of olivine as a special rock that's like a superhero - it can change into different things whenever it needs to! Scientists use olivine to study the Earth's history because it also tells them how old the planet is and what it was like a long time ago. So next time you see a pretty green rock, you can think of it as olivine - the superhero rock!