Sedimentary

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)

Gold-Bearing River Sand

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

Fossiliferous Limestone with Rugose Coral

Lithostrotionella (Limestone Matrix - CaCO3)

Massive Cryptocrystalline Quartz (Chert/Chalcedony Pebble)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Hematite) inclusions

Sandstone

Arenite (primarily SiO2)

Chert

Microcrystalline Quartz (SiO2)

Banded Iron Formation (BIF) / Tiger Iron variety

Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Laterite

Laterite (Iron and aluminum-rich residual rock)

Chert (Yellow variety / Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Golden/Yellow Variety)

Microcrystalline Silica (SiO2)

Chert (Chalky variety)

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)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Flint Nodule

Microcrystalline Quartz (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Chert (Tan/Grey)

Chert (Silicon Dioxide, SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2 primarily)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Flint (variety of Chert)

Silicon Dioxide (SiO2)

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Chert (with Quartz veins)

Microcrystalline quartz (SiO2)

Moqui Marbles

Iron Oxide Concretion (Hematite/Goethite)

Chert / Jasper and River Stones

Microcrystalline Quartz (SiO2)

Sandstone Beach Pebble

Clastic Sandstone (SiO2 - Quartz-dominant)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation