Carbonatite is like a type of rock that is very special because it is made up of a special rock called carbonates, which are minerals that have carbon atoms in them.
Imagine you're making a cake, and you have a recipe that tells you to mix together flour, sugar, and eggs. Carbonatite is like a cake that is made up of calcium, sodium, and potassium carbonates (which are like the flour, sugar, and eggs in your cake recipe).
But just like how different cakes can have different flavors or ingredients, there are different kinds of carbonatites that can have other types of minerals mixed in with the carbonates. Some carbonatites might have diamonds or rare metals in them, which makes them really special and valuable to scientists and businesses.
Carbonatites are also special because they aren't very common in the Earth's crust - scientists think that they may only make up about 0.1% of all rocks on Earth! So when they are discovered, people get really excited because they can tell us a lot about the way the Earth's crust has formed and changed over time.