Organic (Sedimentary Context)

Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Fossil Shell Fragment (possibly Brachiopod or Bivalve)

Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (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)

Petrified Wood

Silicified Wood (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Chalcedony Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone

Calcareous biomicrite / Calcium Carbonate (CaCO3)

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Chert (Field Stone)

Chert (Silicon Dioxide, SiO2)

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (often called Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (White Flint)

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Chert (Green Jasperiod)

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (with Crinoids)

CaCO3 (Calcium Carbonate)

Chert (often called Flint or Jasper if reddish)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Amber

Succinite (Resin C10H16O)

Amber

Succinite (fossilized resin)

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Green Chert (Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper (Brown Iron-Rich Variety)

Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities

Chert (Flint)

Silicon Dioxide (SiO2)