Sedimentary (Chemically Precipitated)

Banded Iron Formation (BIF)

Banded Iron Formation

Limestone (specifically Fossiliferous or Crinoidal Limestone)

Calcium Carbonate (CaCO3) - Calcite Rock

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: Calcium Carbonate / Calcite, Aragonite, and Limestone/Clay)

Quartzite / Chert Nodular Rock

Silicon Dioxide (SiO2) / Microcrystalline Quartz

Quartz Sand / Sandstone grains

Silicon Dioxide (SiO2)

Black Chert (Flint / Basanite)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Smoky Variety)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead/Projectile Point)

Chert (Cryptocrystalline Quartz, SiO2)

Jasper (Chert)

Silicon Dioxide (SiO2)

Chert (River Pebble/Finger Stone)

Microcrystalline quartz (SiO2)

Chert (often associated with Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Arrowheads)

Microcrystalline Quartz (SiO2)

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Ironstone (Limonitic/Hematitic Sandstone)

Ferruginous sandstone (predominantly Fe2O3 and FeO(OH))

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (often called Jasper in this color variety)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper varieties)

Microcrystalline Quartz (SiO2)

Chert (Flint/Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Chert (variations include Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

Chert / Flint

Chert (Cryptocrystalline Quartz, SiO2)

Chert (variations include Flint/Jasper)

Chert (Silicon Dioxide, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Banded Iron Formation

Banded Iron Formation (BIF)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities

Chert (Flint Nobule)

Silicon Dioxide (SiO2)

Chert (Agate/Flint variant)

Microcrystalline Quartz (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Chert / Flint (River Pebble)

Cryptocrystalline Quartz (SiO2)

Chert (Flint/Jasper)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper and Chalcedony)

Silicon Dioxide (SiO2)