Sedimentary (Chemically Precipitated)

Chert (Arrowhead Fragment)

Cryptocrystalline quartz (SiO2)

Banded Chert

Silicon Dioxide (SiO2)

Chert (Siltstone-Chert mixture)

Microcrystalline Quartz (SiO2)

Banded Chert (likely Flint or Jasper variety)

Silicon Dioxide (SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Green Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Black Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Chert (varietal Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (with Drusy Quartz Pocket)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert Nodule

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (and/or Siltstone River Pebble)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Chert (composition: SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Hag Stone

Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)

Jasper (specifically Chert/Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper-rich)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint/Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Ironstone (Limonitic Concretion)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Limestone (likely weathered)

Limestone (Mainly Calcium Carbonate, CaCO3)

Limestone (Elephant Skin or Karst-weathered)

Calcium Carbonate (CaCO3)

Bauxite

Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Limestone

Calcium Carbonate (CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz Sand

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Limestone (specifically Bituminous or Carbonaceous Limestone)

Calcium Carbonate (CaCO3) with Organic Impurities