- chlorination
- chlorination plant
- chlorination process
- chlorine content
- chlorine demand
- chlorine hydrate
- chlorine logging
- chlorinity log
- chloritic schist
- chloritization
- chloroacetate
- chlorocalcite
- chlorocosane
- chlorophyll
- chloropicrin
- chlorotrifluoroethylene
- chocolate rock
- choke control
- choking
- cholestene
- chondrin
- christmatite
- chromatography
- chrome alum
- chromic
- chromiferous
- chromite
- chromite sand
- chromium steel
- chromogenic
- chrysoberyl
- chrysolyte
- chrysotile
- churn drill
- cinchonidine
- cinder block
- cinder dump
- cinder pit
- cinnamic
- cinnamon oil
- christogahamite
- chromate
- chrome leather
- chrome steel
- chromel
- chromic oxide
- chromite brick
- chromosome
- chromosphere
- chronogenesis
- chrysene
- chrysocolla
- chrysophanic
- chuca
- chuk gage
- churchite
- chute door
- chute mouth
- cibetone
- cimene
- ciminite
- Cimmerian unconformity
- cimolite
- cinchona bark
- cinchonine
- cinder
- cinder cone
- cineolic
- cinerite
- cinley coal
- cinnabarite
- cinnamon stone
- cinnoline
- circuit interruption
- circuit noise
- circular projection
- circular seam
- circulating boiler
- circulating head
- circulating oil
- circulating valve
- circulation chart
- circulation oiling
- circulation shaft
- circulator
- cirium
- cirque lake
- citronyl
- circulating reflux
- circulating system
- cirque cutting
- clarification bed
- clarite
- clastomorphic
- claw coupling
- clay band
- clay binder
- clay cement
- clay filtration
- clay gall