Sedimentary (Chemically Precipitated)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Septarian Nodule (or Mudstone with Septarian Cracking)

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

Moqui Marble

Iron Oxide Concretion (Limonite/Hematite over Sandstone)

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Jasper

Jasper (Silicon Dioxide, SiO2)

Ferruginous Sandstone (Ironstone)

Ferruginous Sandstone / Limonite-cemented Quartz Sandstone

Oolite or Oolitic Limestone

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Banded Jasper (Chert)

Silicon Dioxide (SiO2) - variety of Chalcedony

Limonitic Sandstone (Stained Sandstone)

Clastic Sedimentary Rock with Iron Oxide (Limonite/Goethite) staining

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Limestone with Algal/Lichen Colonization

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Lazulite

Lazulite (MgAl2(PO4)2(OH)2)

Jasper and Quartz River Pebble

Silicon Dioxide (SiO2) with impurities

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert Pebble

Microcrystalline silica (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite with Iron-oxide inclusions (SiO2 primarily)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Septarian Nodule (Galt)

Calcareous concretion / Septarian concretion

Oolite (Ooid Limestone)

Ooidal Limestone (comprised of CaCO3)

Ferruginous Sandstone (Grit)

Clastic Sedimentary (Ironstone-rich Sandstone)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (Arrowhead Debitage or Spall)

Silicon Dioxide (SiO₂)

Chert (variations include Flint/Chalcedony)

Chert (SiO2 - Silicon Dioxide)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (often referred to as Flint)

Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Chert (specifically Flint or Dark Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)