Igneous And Sedimentary

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Calcite

Calcium Carbonate (CaCO3)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

White Quartz

Silicon Dioxide (SiO2)

Quartz (Milk/Citrine variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Fluorite (Green Fluorite)

Calcium Fluoride (CaF2)

Hematite

Iron(III) oxide (Fe2O3)

Blue Calcite

Calcite (CaCO3)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz in Matrix

Silicon Dioxide (SiO2)

Carnelian

Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (Grain)

Silicon Dioxide (SiO2)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Glacial Granite with Epidote

Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Cryptocrystalline Quartz (Agate/Chert)

Silicon dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Quartz (Milky or Yellowish)

Silicon Dioxide (SiO2)