Radical 112
Radical 112 or radical stone meaning "stone" is one of the 23 Kangxi radicals composed of 5 strokes.
In the Kangxi Dictionary, there are 499 characters to be found under this radical.
石 is also the 102nd indexing component in the Table of Indexing [Chinese Character Components] predominantly adopted by Simplified Chinese dictionaries published in mainland China.
In Chemical [elements in East Asian languages#Chinese|Chinese names for chemical elements], radical 石 means that this element is solid non-metal at room temperature and standard pressure.