Sedimentary (Fossilized)

Sandstone (Weathered Pebble)

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of Quartz, SiO2)

Limonite-stained Chert/Jasper

Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (SiO2 based)

Shale

Shale (comprised mostly of clay minerals and quartz)

Sandstone

Arenite (SiO2-rich)

Limestone

Calcium Carbonate (CaCO3)

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Shale

Fissile Mudstone (Shale)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Sandstone with Iron Oxide (Limonite/Hematite)

Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Sandstone

Arenite (SiO2 based with quartz, feldspar, or lithic fragments)

Sandstone (with potential iron-oxide weathering)

Arenite (SiO2 based)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Sandstone

Arenite (primarily SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Stromatolite

Laminated biogenic sedimentary structure (formed by Cyanobacteria)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Manganese-coated Sandstone

Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Sandstone (River Cobble)

Clastic sedimentary rock (primarily SiO2 with various lithic fragments)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)