圧し石[oshiishi] stone weight
一石[isseki] one game (of go)
一石二鳥[issekinichou] killing two birds with one stone
英国石油[eikokusekiyu] British Petroleum
下石[shitaishi] nether millstone

化粧石鹸[keshousekken] toilet soap
化石[kaseki] fossil
化石学[kasekigaku] paleontology
化石層[kasekisou] fossil bed
化石燃料[kasekinenryou] fossil fuel

石筍[sekijun] stalagmite
筍生活[takenokoseikatsu] selling one's personal effects in order to live
筍医者[takenokoisha] inexperienced doctor
雨後の筍[ugonotakenoko] similar things turning up one after another

筍虫[takenokomushi] horse botfly larva
筍貝[takenokogai] auger shell (Terebra subulata)
海筍貝[umitakegai] dilate piddock (Barnea dilatata)