Sedimentary (Biogenic)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Banded Calcite (often marketed as Caribbean Calcite)

Calcium Carbonate (CaCO3) + Aragonite

Chert (specifically Yellow or Brown Chert / Jasper)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Flint (or Chert)

Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide) - SiO2

Chert (Flint)

Chert (Silica, SiO2)

Chert (Flint Nodular Variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Petrified Wood

Silicified Wood (primarily SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Quartzite variety)

Microcrystalline Silica (SiO2)

Red Jasper (Skull Carving)

Jasper, a cryptocrystalline variety of Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Ironstone Concretion / Goethite-Hematite Nodule

Goethite/Hematite (α-FeO(OH) / Fe2O3)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint)

Silicon dioxide (SiO2)

Chert (Nodular Chert)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper (possibly banded)

Silicon Dioxide (SiO2) with iron oxide inclusions

Cryptocrystalline Quartz (Agate/Chert)

Silicon dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Fossilized Brachiopod

Brachiopoda (Class Rhynchonellata or Spiriferida)

Chert (and its variety Flint)

Silicon dioxide (SiO2) / Microcrystalline quartz

Chert (Chert Nodule with Cortex)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Jasper or Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Chert (specifically Flint)

Cryptocrystalline Quartz (SiO2)

Picture Jasper

Jasper (Silicon Dioxide, SiO2 with impurities)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Black Jasper

Black Jasper (Silicate mineral - SiO2)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix