Sedimentary Like (Industrial Composite)

Sandstone (Ferruginous)

Arenite with Iron Oxide matrix

Chert (often called Flint when found in chalk)

Microcrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2) with impurities

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Yellow/Tan)

Microcrystalline Quartz (SiO2)

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert / Jasper

Sedimentary Cryptocrystalline Quartz (SiO2)

Sandstone (Greywacke)

Arenite / Clastic Sedimentary Rock

Vesicular Sandstone

Clastic Sedimentary Rock (Sandstone)

Banded Chert

Sedimentary Cryptocrystalline Quartz (SiO2)

Coprolite

Fossilized feces (various taxa)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (Weathered)

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Coquina / Shelly Limestone

Bioclastic Limestone (composed of CaCO3)

Conglomerate

Conglomerate (clastic sedimentary rock type)

Dalmation Jasper (or Dalmation Stone)

Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode

Quartz

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (Sedimentary Clastic Rock)

Sandstone (likely Quartzose Sandstone with mineral staining)

Arenite (composed mainly of SiO2)

Reddish Brown Claystone or Siltstone

Argillite / Siltstone / Claystone

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or limonite inclusions

Chert (Basanite / Flint variety)

Microcrystalline Quartz (SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Tufa

Calcareous Tufa (CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (iron-rich)

Chert (Flint)

Chert (SiO2)

Chert (specifically Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Aluminum Slag

Anthropogenic Aluminum (Al)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions