> For the complete documentation index, see [llms.txt](https://docs.catplanets.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.catplanets.io/in-game-assets/crystal.md).

# Crystal

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**Crystals** are the **primary resource** found on planets and are collected by the **cats**. Each crystal can only be mined by **one cat at a time**.

The number of crystals that appear on the ground is directly influenced by the **total number of cats** present on the planet. The more cats, the greater the **crystal abundance** for mining.