Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Chert (often called Flint in this context)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Banded)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (clastic sediment)

Silicon Dioxide (SiO2) in matrix

Agate / Banded Chalcedony

Agate (Silicon Dioxide / SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Quartz-veined Schist (or Metasandstone)

Metamorphic Rock with Quartz Veining (SiO2)

Chert / Yellow Jasper

Silicon Dioxide (SiO2)

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Granite Pebble (River Rock)

Granite (composed primarily of Quartz, Feldspar, and Mica)

Limestone (specifically Iron-stained or Argillaceous Limestone)

Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (River Cobble)

Arenite

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide - SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Quartzite Pebble

Quartzite (SiO2)

Banded Chert (River Stone)

Silicon Dioxide (SiO2)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Chert

Microcrystalline Quartz (SiO2)

Chert (and Chert-Jasper mix)

Microcrystalline Quartz (SiO2)

Chert (Flint)

SiO2 (predominantly microcrystalline or cryptocrystalline quartz)