Sedimentary And Igneous (Mixed)

Pyrite

Iron Pyrite (FeS2)

Magnetite

Magnetite (Iron(II,III) oxide, Fe3O4)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or igneous host

Quartz (Druzy)

Silicon Dioxide (SiO2)

Raw selenite (gypsum)

Gypsum, CaSO₄·2H₂O; translucent variety selenite

Quartz

Silicon Dioxide (SiO2)

Quartz (Variety: Agate / Chalcedony)

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

White Quartz

Silicon Dioxide (SiO2)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Basalt with Chert or Jasper Inclusion

Igneous basalt / sedimentary chert nodule

Feldspar-rich Quartzite

Metamorphic Quartz-Feldspar Aggregate (SiO2 + KAlSi3O8)

Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Geode

Quartz / Chalcedony nodule

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (SiO2)

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)