Sedimentary (Anthropogenic)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline quartz (SiO2)

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Greywhacke (River Pebble)

Graywacke (immature sandstone)

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Chert (often called Flint when dark or worked)

Cryptocrystalline silica (SiO2)

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert / Flint

Chert (SiO2)

Chert (Nodule)

Chert (Silicon Dioxide, SiO2)

Chert (within Asphalt)

Chert (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (with Iron Oxide)

Chert (Yellow variety / Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3 - Hematite/Goethite shell with Sandstone core)

Laterite

Laterite (Iron and aluminum-rich residual rock)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Golden/Yellow Variety)

Microcrystalline Silica (SiO2)

Chert (Chalky variety)

Microcrystalline Quartz (SiO2)

Chert / Flint

Microcrystalline Silica (SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (specifically Tan/Yellow Chert)

Silicon Dioxide (SiO2)

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Chert (Quartz Variety)

Chert (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Septarian Nodule (or Mudstone with Septarian Cracking)

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Claystone)

Coquina Jasper

Fossiliferous Chalcedony (SiO2)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

River Rock (Greywacke/Siltstone)

Siltstone / Argillaceous Greywacke

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

Chert (Black Flint)

Chert (Microcrystalline Quartz, SiO2)

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Sandstone Moqui Marble (Concretion)

Iron oxide concretion (Hematite/Goethite and Quartz)