- G
-
- Gamma rays
- Gangue material
- Garnet paper
- Geiger counter
- Gem
- Gemology
- Gemologist
- Gemstone
- Geode
- Geologic
- Geology
- Geologist
- Glass
- Glassy (luster)
- Gneiss
- Glauber's salt
- Globular
- Goniometer
- Grain (aggregate)
- Grain (weight)
- Grainy
- Gram
- Granitic
- Granular
- Gravel
- Gravity
- Greasy (luster)
- Group
- Grouping