Sedimentary (Physico Chemical)

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varietal: Jasper or Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (variant Flint)

Silicon Dioxide (SiO2)

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Chert / River Pebble

Microcrystalline Silica (SiO2)

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Chert (variously Flint or Jasper gravel)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Septarian Nodules / Weathered Silex)

Microcrystalline Quartz (SiO2)

Chert (vuggy/nodular)

Microcrystalline Quartz (SiO2)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Chert Pebble Map

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Chert (Gold-toned Jasper)

Silicon Dioxide (SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Banded Flint / Chert

Silicon Dioxide (SiO2)

Chert / Flint Nodules

Cryptocrystalline Quartz (SiO2)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (often called Flint when dark)

Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)

Chert (Nodule)

Chert (Microcrystalline Quartz, SiO2)

Chert (Basanite variety) with Quartz Vein

Microcrystalline Quartz (SiO2)

Chert (Grey Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Limestone)

Silicon Dioxide (SiO2)

Chert (Grey Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Onyx (Green Onyx)

Banded Calcite or Travertine (CaCO3)

Chert (and Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (specifically Black Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)