None

Clear Quartz

Silicon Dioxide (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (Sedimentary Rock)

Chert (or Flint)

Mocrocrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Jasper in Quartzite (likely Cinnabar or Iron inclusions)

Silicon dioxide (SiO2) with impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe)

Quartzite Pebble

Quartzite (primarily SiO2)

Clear Quartz (Double Terminated)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chalcedony

Chalcedony (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

White Sapphire

Corundum (Al2O3)

Chert

Chert (Microcrystalline Quartz, SiO2)

Gold Flakes in Oil (Novelty Specimen)

Native Gold (Au)

Hematite

Iron(III) oxide (Fe2O3)

Slag Glass

Glassy Silicate Residue

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Chert (with Liesegang Banding)

Microcrystalline quartz (SiO2)

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with inclusions

Ferruginous Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (variously known as Flint or River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Botryoidal Hematite (Kidney Ore)

Iron(III) oxide (Fe2O3)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Chert (Gravel)

Chert (Cryptocrystalline silicon dioxide, SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite pebble

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Green Adventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Golden Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)