Anthropogenic Sedimentary Style Organic Solid

Crinoid Fossil in Limestone

Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)

Shale (possibly Carbonaceous or Oil Shale)

Laminated Mudstone (primarily clay minerals and quartz)

Chert (Brown Chert / Flint)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Jasperoid)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Septarian Nodule (Polished)

Septarian concretion (Calcite, Aragonite, Limestone)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Cherty Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Chert (with inclusions)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Chert / Flint

Chert (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Chalky variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Chert (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Jasper (Petrified Wood Variety)

Silicon Dioxide (SiO2)

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Chert (and associated river cobbles)

Silicon dioxide (SiO2)

Chert Pebble

Microcrystalline or cryptocrystalline Quartz (SiO2)

Fossilized Coral

Scleractinian Anthozoa (Fossilized Calcium Carbonate, CaCO3)

Chert (often called Flint or River Stone)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossil Coral (Honeycomb Coral)

Favosites (extinct genus of Tabulate coral)

Chert (specifically Flint)

Silicon Dioxide (SiO2)

Chert Pebble

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (and Chalcedony)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)