Sedimentary And Igneous (Mixed)

Magnetite

Iron(II,III) oxide (Fe3O4)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (specifically a water-worn pebble)

Gneiss

Quartz

Silicon Dioxide (SiO2)

Gneiss (Gneissic Granite)

Gneiss

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Fluorite

Calcium Fluoride (CaF2)

Gneiss

High-grade metamorphic rock (Gneiss)

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Quartz pebble

Silicon dioxide (SiO2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Gneiss

Gneiss

Gneiss

Gneiss

Hematite with Magnetite

Iron Oxide (Fe2O3)

Quartz (Agate/Chalcedony variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (CaCO3)

Quartz

Quartz (Silicon Dioxide, SiO2)

Auriferous Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)