Sedimentary (Fossilized Organic Matter)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Green Jasper

Silicon Dioxide (SiO2) with impurities of iron(II) silicate

Chert (Nodule)

Chert (composition: SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Cherty Shale / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Yellow/Honey Jasper variety)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Yellow Jasper / Chert

Jasper (Silica/Quartz) - SiO2

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper-rich)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ironstone Concretion (Iron-rich Mudstone)

Siderite / Geothite concretion (FeCO3 / FeO(OH))

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

Glauconitic Sandstone

Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2

Chert (Jasper variety)

Chert (Silicon Dioxide, SiO2)

Chert (Flint)

Chert (SiO2)

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (with Limestone/Dolomite host)

Microcrystalline Quartz (SiO2)

Chert (Black Chert or Flint)

Silicon Dioxide (SiO2)

Chert (Pink Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (and Jasper blend)

Chert (Microcrystalline Quartz, SiO2)

Chert (varieties include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow/Brown Jasper)

Silicon Dioxide (SiO2)