Sedimentary (Biogenic)

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Coquina

Coquina Limestone

Chert (Nodular Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ocean Jasper (Sea Jasper)

Spherulitic Chalcedony (SiO2)

Chert (Nodule/Common Chert)

Microcrystalline quartz (SiO2)

Crushed Stone / Greywacke

Greywacke (Indurated Sandstone)

Moqui Marble (Shaman Stone)

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

Fossilized Solitary Rugose Coral

Order Rugosa (commonly Horn Coral)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic inclusions

Chert (Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Banded Sandstone

Arenite (with iron oxide banding)

Chert (Hag Stone / Hole Stone)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Chert (White Chert or Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Shark Tooth

Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (and Flint)

Chert (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

Jasper Conglomerate

Jasperoid Conglomerate (predominantly SiO2 with iron oxide impurities)

Chert (Common Variety)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)

Chert (Limestone-based)

Silicon Dioxide (SiO2) within Carbonate host

Chert (Banded)

Microcrystalline Quartz (SiO2)

Dragon Stone (Septarian Nodule/Concretion)

Septarian Concretion (Composition: Calcite, Aragonite, Limestone/Clay)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Pink Chert or Jasperized Chert)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Fossiliferous)

Silicon Dioxide (SiO2)

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions), SiO2

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides