Sedimentary And Igneous

Pyrite in Matrix

Iron Sulfide (FeS2)

Epidote

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))

Granite Gneiss

Granitoid Gneiss

Hematite

Iron Oxide (Fe2O3)

Hematite

Iron Oxide (Fe2O3)

Hematite

Iron Oxide (Fe2O3)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Magnetite (Lodestone variant potential)

Magnetite (Fe3O4)

Pyrite

Iron Disulfide (FeS2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gneiss (Green Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Carnelian

SiO2 (Microcrystalline Quartz / Chalcedony)

Pyrite

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Gneiss

High-grade Metamorphic Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (Granitic Gneiss)

Gneiss

Brown Agate

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Quartz

Silicon Dioxide (SiO2)

Calcite

Calcite (Calcium Carbonate - CaCO3)

Quartz

Silicon dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)