Igneous, Sedimentary, Metamorphic

Clear Quartz

Silicon Dioxide (SiO2)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Almandine Garnet

Almandine [Fe3Al2(SiO4)3]

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss

High-grade Metamorphic Gneiss

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Banded Gneiss

Gneiss (Metamorphic rock predominantly containing quartz, feldspar, and mica)