Organic (Sedimentary Context)

Chert (and/or River Pebble)

Microcrystalline silica (SiO2)

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Chert (with Limestone and Iron Oxide staining)

Cryptocrystalline Quartz (SiO2)

Chert (White/Light Tan)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Fossiliferous Shale

Laminated Mudrock with plant fossils

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (specifically Gray/Tan Chert Node)

Microcrystalline Quartz (SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Coquina / Shelly Limestone

Coquina (Biogenic Limestone)

Petrified Wood

Silicified Wood (SiO2)

Chert (specifically Flint or Common Chert)

Microcrystalline Quartz (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Limestone-based)

Silicon dioxide (SiO2)

Chert (Flint nodule)

Chert (SiO2)

Fossilized Horn Coral

Order Rugosa (Rugose Coral)

Chert (Chert / Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Chert (Nodular or Fossiliferous)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Chert (often called Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (and Flint)

Microcrystalline Silica (SiO2)

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

Fossilized Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)