Organic (Sedimentary Associated)

Chert (Flint variety)

Microcrystalline context of Quartz (SiO2)

Black Jasper

Silicon Dioxide (SiO2) with Carbonaceous inclusions

Chert (often called Flint)

Chert (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Jasper

Silicon dioxide (SiO2)

Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Coquina

Biogenic Limestone (Calcite/Aragonite base, CaCO3)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

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)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (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

Petrified Wood

Silicified Wood (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 (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint)

Silicon Dioxide (SiO2)

Banded Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Field Stone)

Chert (Silicon Dioxide, SiO2)

Chert (often called Flint)

Chert (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 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 (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Chert (often called Flint or Jasper if reddish)

Microcrystalline Quartz (SiO2)

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz