Sedimentary (Biogenic)

Bumble Bee Jasper

Calcite-bearing Volcanic Tuff (not a true Jasper)

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

Orthoceras Fossil Limestone

Orthoceras (extinct Cephalopod fossil) in Matrix

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Petrified Wood

Silicified Wood (SiO2)

Fossilized Stingray Mouth Plate

Myliobatidae dental battery

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Glauconitic Sandstone

Glauconitic Sandstone (complex silicate formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Chert (often colloquially referred to as Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Limestone

Calcium carbonate ( преимущественно CaCO3)

Red Jasper

Silicon Dioxide with Hematite (SiO2 + Fe2O3)

Chert (Nodular Flint)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone

Arenite (SiO2 based)

Chert (specifically Yellow/Tan Chert)

Silicon Dioxide (SiO2)

Green Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2)

Jasper (Zebra Jasper)

Silicon Dioxide (SiO2) with impurities

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Anthracite Coal

Coal (predominantly carbon)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Greywacke

Greywacke (Lithofeldspathic Sandstone)

Jasper with Quartz (Agate/Jasper mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Petoskey Stone (Coral Fossil)

Hexagonaria percarinata (Fossilized colonial rugose coral)

Chert (Flinty variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Sandstone Concretion

Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Chert (specifically Blue Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Quartzite river stone)

Microcrystalline Silicon Dioxide (SiO2)

Glauconitic Sandstone

Glauconitic Quartz Arenite

Fossilized Knightia Fish

Knightia eocaena (set in fossiliferous Micritic Limestone)

Jasper (specifically Green Jasper/Chert)

Jasper (Silicon Dioxide, SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Banded Calcite (often sold as Yellow Aragonite or Onyx)

Calcium Carbonate (CaCO3)

Gold-Bearing River Sand

Auriferous Placer Sand (Au + various minerals like SiO2 and Fe3O4)

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)