Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Ferruginous Chert (Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Granite

Granite (a felsic intrusive igneous rock)

Quartzite

Quartzite (SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)

Turquoise

Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O

Pink Granite

Granite (Phaneritic intrusive igneous rock)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Quartzite Pebble (Beach Pebble)

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite (Yellow/Tan Quartz Cobble)

Metamorphosed Quartz Sandstone (SiO2)

Red Jasper

Silicon Dioxide (SiO2) - Opaque microcrystalline quartz

White Quartz (Tumbled)

Silicon Dioxide (SiO2)

Conglomerate

Conglomeratic Sandstone

White Agate (Chalcedony)

Agate (Silicon Dioxide - SiO2)

Sandstone

Arenite (SiO2 based clastic rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

Quartzite (River Pebble)

Quartzite (primarily SiO2)

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Carnelian (a variety of Chalcedony)

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Granite

Granite (Phaneritic intrusive igneous rock)

Petrified Wood

Silicified Wood (SiO2)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Dyed and Metallic Coated Agate Geode

Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Fire Agate (Crackle Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (variations include Flint/Jasper)

Chert (Silicon Dioxide, SiO2)

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Gneiss

Gneiss (High-grade metamorphic rock)

Red Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye

Granite

Intrusive Phaneritic Felsic Igneous Rock

Granite Cobble

Phaneritic Felsic Igneous Rock (Granite)

Granite

Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Chert / Chalcedony

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)