Sedimentary (Fossilized Organic Matter)

Chert (often called Flint or River Pebble)

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Chert (often called Flint in archaeological contexts)

Silicon Dioxide (SiO2)

Banded Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Flint variety)

Microcrystalline Silica (SiO2)

Chert (Jasper nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert / Flint

Silicon Dioxide (SiO2)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Chert (Green variety)

Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (and Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (White-Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Red Chert (Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Quartz Variety)

Chert (SiO2)

Chert (Gravel)

Microcrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Red Chert / Flint)

Silicon Dioxide (SiO2)

Chert (White Chert/Flint)

Chert (SiO2)

Chert (Quartz)

Microcrystalline Silica (SiO2)

Chert (varieties include Jasper or Flint)

Chert (Microcrystalline Silica, formula: SiO2)

Chert (Brecciated River Cobble)

Silicon Dioxide (SiO2)

Banded Chert (River Stone/Cobble)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Common Chert)

Silicon Dioxide (SiO2)

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Chert (with Lichen)

Microcrystalline Quartz (SiO2)

Red Chert (Jasper)

Silicon Dioxide (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Gastropod Fossil (Internal Mold)

Phylum Mollusca, Class Gastropoda (Steinkern)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Chert (Jasper variety)

Chert (SiO2)

Pink Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O)

Chert (Commonly known as Flint or Jasper when pigmented)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Arrowhead/Artifact Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)