Igneous, Sedimentary, And Metamorphic

Pyrite on Quartz matrix

Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Magnetite (Octahedral Crystal)

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate, CaCO3

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Pebble)

Silicon Dioxide (SiO2)

Clear Quartz (Faceted)

SiO2 - Silicon Dioxide

Faceted Clear Quartz or Diamond Simulant

Silicon Dioxide (SiO2) if Quartz or Cubic Zirconia (ZrO2) if Synthetic

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Zoisite with Ruby

Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)

Pyrite

Iron Sulfide (FeS2)

Magnetite

Magnetite (Fe3O4)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Quartz Pebble

Silicon Dioxide (SiO2)

Pyrite

Iron Pyrite (FeS2)

Quartz (Agate/Jasper pebble)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Pyrite (Fools Gold)

Iron Disulfide (FeS2)

Quartz (Milky/Snow)

Silicon Dioxide (SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Magnetite Orthorthotropic Rock

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Magnetite (Lodestone)

Magnetite (Fe3O4)