Sedimentary Rock (Cryptocrystalline Quartz)

Chert Nodule (Flint)

Microcrystalline Quartz (SiO2)

Flower Agate

Chalcedony (cryptocrystalline Quartz) with Spherulite inclusions; SiO2

Chalcedony (Agate/Carnelian precursor)

Chalcedony (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite/Quartz Arenite

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Botryoidal Agate

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Sandstone

Arenite (SiO2 primarily)

White Chalcedony (Agate)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Chert (Jasper or Flint variant)

Chert (composed of microcrystalline quartz, SiO2)

Chert (Flint)

Chert (SiO2)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Chert (specifically tan/pink variety)

Silicon Dioxide (SiO2)

Chert (specifically Gray Chert)

Chert (SiO2)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Ferruginous Quartz

Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 impurities)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Weathered)

Arenite (primarily SiO2)