Organic (Biological Specimen)

Chert (Yellow Jasper/Honey Chert)

Silicon Dioxide (SiO2)

Chert (Iron-rich or Slate-like variant)

Silicon Dioxide (SiO2)

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Chert

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Fossil Bivalve Shell

Class Bivalvia (e.g., Veneriidae family)

Piddock-bored Mudstone

Lutite (Siltstone or Mudstone) with Pholad borings

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Limestone pebble

Sedimentary rock composed mainly of calcium carbonate (CaCO3)

Banded Limestone

Calcareous sedimentary rock (CaCO3)

Hag Stone (Odin Stone / Adder Stone)

Perforated Pebble (commonly Chert, Mudstone, or Limestone)

Grey Chert River Pebble

Microcrystalline Quartz (SiO2)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Banded Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or River Pebble)

Chert (Microcrystalline Quartz, SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (River Pebble)

Silicon Dioxide (SiO2)

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Chert with Crinoid Fossil Impression

Microcrystalline Quartz (SiO2) with Crinoidea fossil impression

Chert (specifically Yellow/Honey Jasper variety)

Cryptocrystalline Quartz (SiO2)

Chert (Gravel)

Microcrystalline Quartz (SiO2)

Chert (varieties include Jasper or Flint)

Chert (Microcrystalline Silica, formula: SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Banded Chert (River Stone/Cobble)

Microcrystalline Quartz (SiO2)

Chert (Brecciated River Cobble)

Silicon Dioxide (SiO2)

Chert (Jasper-rich)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (Pebble)

Microcrystalline silica (SiO2)

Chert (Quartz Variety)

Chert (mostly SiO2 / Silicon Dioxide)

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Pyrite-bearing Rock

Iron Sulfide (FeS2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with fossil inclusions

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)