Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite

Gold Ore (in Quartz/Sulfide matrix)

Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Basalt with Scoria and potential Olivine/Pyroxene inclusions

Vesicular Basalt

Quartz (Double-Terminated)

Silicon Dioxide (SiO2)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Petrified Wood

Silicified Wood (primarily SiO2)

Jasper

Silicon Dioxide (SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Basalt River Pebble

Basalt (fine-grained mafic igneous rock)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial colorants

Tumbled Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Petrified Wood

Silicified Wood (SiO2)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silica - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Chert (Flint variety)

Chert (SiO2)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)