A part
石
Shown as a part of 3 words so far, read 2 ways.
せき 2 words
- 石炭せきたんcoal
石炭 · here “stone”
- 化石かせきfossil, petrifaction, fossilization
化石 · here “stone”
せっ 1 word
- 石鹸せっけんsoap
石鹸 · here “stone” (from せき)
Also written with 石
These words contain the character in their spelling but show no breakdown that names it, so nothing is claimed about its role in them.