Sedimentary

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Conglomerate with Quartz Inclusions

Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Banded Jasper with Hematite or Quartz

Silicon Dioxide (SiO2) with impurities

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Limestone

Limestone (Calcium Carbonate - CaCO3)

Sandstone (lithic/greywacke variety)

Arenite (composed primarily of SiO2 with various lithic fragments)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Chert (Flint)

Silicon Dioxide (SiO2)

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

Chert (Yellow/Tan Variety)

Chert (SiO2)

Sandstone

Arenite (composed primarily of SiO2, or Silicon Dioxide)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Quartzite-grade)

Arenite (primarily SiO2)

Sandstone (Quartz Arenite)

Sandstone (Chemical formula: primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Crushed Limestone (Gravel)

Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily Quartz, SiO2)

Limestone

Calcium Carbonate (CaCO3)

Bauxite

Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)

Limestone

Calcium Carbonate (CaCO3)