Sedimentary And Igneous

Quartz

Silicon Dioxide (SiO2)

Gneiss (Gneissic Granite)

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Gneiss (specifically a water-worn pebble)

Gneiss

Magnetite

Iron(II,III) oxide (Fe3O4)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

High-grade metamorphic rock (Gneiss)

White Quartz

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Pyrite

Iron Sulfide (FeS2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (CaCO3)

Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Gneiss

Gneiss

Hematite with Magnetite

Iron Oxide (Fe2O3)

Gneiss

Gneiss

Quartz

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Auriferous Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)