cordierite-norite - crouan
- Cricotids
- criggling
- crimp
- crimps
- crinanite
- crinkle
- crinoid
- crinoidal
- crinoidal limestone
- crinoids
- cripple
- criquina
- criquinite
- crisier
- criss-cross structure
- crisscross
- crisscross texture
- crisscross-bedding
- crista
- cristate
- cristobalite
- critical concentration
- critical gas saturation
- critical incidence
- critical oil saturation
- critical overview
- critical ray
- critical reflection
- critical saturation
- critical tractive force
- critically reflected wave
- crizzly
- CRM
- croaker
- crocalite
- crocidolite
- crocoite
- crocus
- crocydite
- Croixian