That's correct! A mineral that occurs in the Earth's crust is naturally occurring. This means it wasn't made by humans or any manufacturing process.

Here's why:

* Naturally occurring: Minerals form through geological processes, like the cooling and crystallization of magma, the precipitation of minerals from water, or the transformation of existing minerals.

* Not manmade: Humans can create synthetic materials that mimic the properties of minerals, but these are not considered true minerals.

* Not manufactured: Minerals are found in nature and extracted from the Earth, not produced in factories.

Let me know if you have any other questions!