- S
-
- Saccharoidal
- Saline
- Saline deposite
- Saline lake
- Salinity
- Salt
- Salt dome
- Sand
- Scalenohedral
- Scalenohedron
- Scales
- Scaly
- Scepter
- Sclerometer
- Schiller
- Schist
- Secondary
- Secondary mineral
- Sectile
- Selenides (subgroup)
- Selvage
- Sediment
- Sedimentary rock
- Sedimentation process
- Semi-metal
- Semi-metallic
- Semi-metallic elements
(subgroup)
- Semi-precious stone
- Series
- Setting
- Shaft
- Sheaflike
- Sheet silicates
- Shelly (fracture)
- Shortwave
- Silica
- Silicafied
- Silica gel
- Silica group
- Silicates (group)
- Sill
- Silky (luster)
- Silt
- Simple oxides (subgroup)
- Simple sulfides (subgroup)
- Sinter
- Sixling
- Skeletal
- Slab
- Slag
- Smelt
- Smooth (fracture)
- Soil
- Solid solution
- Solidify
- Solubility
- Soluble
- Sorosilicates (subgroup)
- Spar
- Specific gravity
- Specimen
- Spectra
- Spectral
- Spectrograph
- Spectrophotometer
- Spectroscope
- Spectroscopy
- Spectrum
- Sphenoidal
- Spherulite
- Spherulitic
- Spinel
- Splendent (luster)
- Splintery (crystal habit)
- Splintery (fracture)
- Stable
- Stalactites
- Stalactitic
- Stalagmites
- Stalagmitic
- Staurolite twin
- Stellate
- Stock
- Stone
- Streak
- Streak plate
- Striated
- Striations
- Strata
- Stratification
- Stratum
- Structural
- Structure (minerals)
- Structure (rocks)
- Stubby
- Stud
- Subconchoidal (fracture)
- Subgroup
- Sublimate
- Sublimation
- Submetallic (luster)
- Sulfates (group)
- Sulfides (group)
- Sulfosalts (subgroup)
- Sulfuric acid
- Surrounding rock
- SW
- Swallowtail twin
- Syenite
- Symmetrical
- Symmetry
- Synthesized
- Synthetic
- Synthetic gem