fluorspar - front of thrust
- free-floating margin of mat
- free-flowing
- free-milling
- free-milling ore
- free-moving
- free-open textured
- free-surface energy
- free-surface multiple
- freeboard
- freeing from dust
- freely burning
- freely burning fire
- freely suspended charge
- freestone
- freeze
- freeze cellar
- freeze fracture
- freeze pipe
- freeze-up date
- freezeup
- freezing
- freezing hole
- freezing method
- freezing method of shaft-sinking
- freezing of rocks
- freezing pipe
- freibergite
- freieslebenite
- freirinite
- fremontite
- French chalk
- frenulum
- frequency
- frequency band
- frequency bandwidth
- frequency content
- frequency curve
- frequency diagram
- frequency electromagnetic sounding
- frequency interval