Mixed: Igneous And Sedimentary

Quartz (Milky or Grainy Variety)

Silicon Dioxide (SiO2)

Quartz (Milky or Clear variety)

Silicon Dioxide (SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Agate (Nodule/Chert)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Almandine Garnet

Almandine [Fe3Al2(SiO4)3]

Hematite

Iron(III) oxide (Fe2O3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Yellow Calcite

Calcium Carbonate (CaCO3)

Gneiss

High-grade Metamorphic Gneiss

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Clear Quartz

Silicon Dioxide (SiO2)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Orange Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

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)

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)