Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Chert (variations include Flint/Chalcedony)

Chert (SiO2 - Silicon Dioxide)

Chert (Jasper)

Silicon Dioxide (SiO2)

Carnelian Agate

Carnelian (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

Banded Agate (specifically Sardonyx or Carnelian Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Sandstone (Quartz Arenite)

Clastic Sedimentary Rock - Quartz Arenite

Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (SiO₂)

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (often called Flint when dark)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (specifically Tan/Yellow Chert)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert (specifically Flint or Dark Chalcedony)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Crushed Limestone and Calcite

Calcium Carbonate (CaCO3)

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO₂)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Red Moss Agate or Jasper-Agate

Silicon Dioxide (SiO2)

Chalcedony (Pink/Gray variety)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Quartz Veined Siltstone or Graywacke

Clastic Sedimentary Rock with Quartz (SiO2) veining

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Chert (Flint Nobule)

Silicon Dioxide (SiO2)