Quartz

Quartz (Milky or Druzy variety)

Silicon Dioxide (SiO2)

White Calcite

Calcium Carbonate (CaCO3)

Granite

Phaneritic Plutonic Felsic Rock

Granitic Pegmatite with Tourmaline and Sphalerite

Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Granite

Phaneritic Felsic Igneous Rock

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Blue Chalcedony

Chalcedony (SiO2)

Smoky Quartz (with Druzy/Polished Edge)

Smoky Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz Cobble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Agate with Druzy Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Ferruginous Quartz

Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3/FeO(OH))

Quartz Geode

Silicon Dioxide (SiO2)

Tourmalinated Quartz

Quartz (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) inclusions

Gold Nugget

Native Gold (Au)

Larvikite

Monzonite (intermediate intrusive igneous rock containing plagioclase, alkali feldspar, augite, and biotite)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Chert (specifically Gray Chert)

Chert (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Druzy Geode

Silicon Dioxide (SiO2)

Quartz (Yellow/Milky variety)

Silicon Dioxide (SiO2)

Quartzite Breccia

Brecciated Quartzite (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)