Anthropogenic Sedimentary Style Organic Solid

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Petrified Wood

Silicified Wood (primarily SiO2)

Travertine (often colloquially called Tufa)

Chemical Sedimentary Calcium Carbonate (CaCO3)

Massive Cryptocrystalline Quartz (Chert/Chalcedony Pebble)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Banded Chert (or River Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Chert (variously identified as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Septarian Nodule (Thunder Egg)

Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Concrete

Hydrated Portland Cement Aggregate Composite

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides

Petrified Wood

Silicified Wood (SiO2)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Glauconitic Sandstone

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

Coquina

Biogenic Limestone (Calcium Carbonate - CaCO3)

Chert (with Quartz vein)

Chert (Silicon Dioxide, SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Chert (variant Flint/Jasper)

Microcrystalline Opaline Silica (SiO2)

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Jasper

Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)

Chert (Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale