Sedimentary

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Sandstone Moqui Marble (Concretion)

Iron oxide concretion (Hematite/Goethite and Quartz)

Petrified Wood

Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)

Chert (and/or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint or River Stone)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Anthracite

Anthracite Coal

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Ironstone (Limonitic Sandstone)

Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)

Chert (Yellow or Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossil Coral (Petoskey Stone / Rugose Coral)

Hexagonaria percarinata (Order: Rugosa, Fossilized Calcium Carbonate CaCO3)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Coral (Honeycomb Coral)

Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)

Chert (Jasper variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert / Jasper)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Stromatolite

Cyanobacteria fossilized formation (CaCO3)

Ferruginous Sandstone (Gozzanous)

SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating

Grey Limestone Pebble

Limestone (Calcium Carbonate - CaCO3)

Red Sandstone

Arenite (primarily Quartz with Iron Oxide)

Greywacke

Lithic Sandstone (Greywacke - (SiO2+Al2O3+Fe2O3))

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Asphalt (Bituminous pavement fragment)

Artificial conglomerate / Bitumen-Aggregate mixture

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Nodule)

Microcrystalline or Cryptocrystalline Silica (SiO2)

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Chert (Jasper/Chalcedony)

Microcrystalline Silica (SiO2)

Moqui Marble (Iron-Oxide Concretion)

Iron Oxide Concretion (Fe2O3)

Chert (Cherty Flint/Jasper variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Green variety)

Chert (Silicon Dioxide, SiO2)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or limonite inclusions

Chert (Basanite / Flint)

Microcrystalline silica (SiO2)

Chert (Arrowhead Artifact)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Red Jasper

Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)

Mookaite Jasper

Silicified Radiolarite (SiO2 with impurities)

Crinoid Stem Fragment

Crinoid (Phylum Echinodermata, Class Crinoidea)