> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/soils/soils.sol/rock.md).

# rock

The percent of the sample that has a particle diameter > 2 mm, i.e. the percent of the sample that does not pass through a 2 mm sieve.